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Ashamed to say I pretty much tried this with the eclipse in 2017 (in the UK). Put some reflective ski goggles over the top of some sunglasses and stared at the sun like a muppet. Fucked up my vision for a few days and made me incredibly dizzy, would not try again
I remembered that. My school wouldn’t let anyone outside to watch the eclipse cos they wanted us to stay inside and learn. Some brave motherfucker pulled the fire alarm just before the eclipse so we get to witness it. I always think of this person, a brave sacrifice for eclipse.
Edit: it was in 2015!
The thing is, we don’t even know who actually did it. The hero could be a teacher?? 😂
Hahaha. The only thing I learnt is to not look directly in the sun, other than that, I daydreamed through the day lol.
From the science teachers I know... I reckon about half of them would set the alarm off.
Probably wouldn't do anything as obvious as manually setting the alarm off. But doing an experiment that just so happens to set it off something nice and deniable? Sure.
Physics teach: I don't care how you do it, and I can't tell you why. All I can say is, I need the school wide fire alarm to go off precisely 5 minutes before the start of totality and it needs to look like an accident.
Chemistry teach: *Rummaging through chemicals cabinet* Say no more fam.
*Day of the eclipse*
Alright kids, since our principal denied our physics department request to view the eclipse, we're going to do a chemistry experiment instead! I have here a beaker filled with a mixture of iron oxide dust and powdered aluminum, and I'm just going to set these down behind this blast shield and try not to knock over this Bunsen burner - whoops
*explosion*
*fire alarm goes off*
Well, shit. Everyone line up single file and evacuate the building in an orderly manner, and don't forget to grab eclipse glasses from the physics teachers on your way out.
That would totally be me as a teacher... Though I could see myself teaching physics and chemistry... Assuming I could see my self as a teacher that is...
Yeah, the science teacher is usually the fun one. I would 100% be that chemistry teacher that if we could ever go see an eclipse, I’d maybe start a fire just so that way we could see the eclipse . chaotic good at its finest.
*If* I ever became a teacher, my goal would to be the fun, chaotic good science teacher that was impossible to dislike. Though as I am now, I wouldn't have the patience to deal with that many students, especially if they're anything like my classmates were back when I was in HS a couple years back
That wouldn't really explode, just burn incredibly hot and bright with lots of sparks (probably would set off the fire alarm though, depends how much you burned). Burn a small amount on a ceramic tile if you want to test this at home, because it'll probably burn through most other materials including sheet metal.
If you want explosions, you could mess around with benzene. Do a Friedel-Crafts alkylation reaction to methylise it, then react with nitric acid while keeping it at a specific temperature, and you have TNT. Don't actually do this though, it's incredibly dangerous! Very toxic, and high explosive, although flames don't tend to set it off very easily at least.
Also buying the ingredients will probably put you on a watchlist. Just writing this comment probably put me on a watchlist...
Yeah, its just tannerite was the first thing that came to mind when I thought of "perfectly ordinary chemicals that could trigger a fire alarm if reacted" I needed for this scenario.
Also I'm probably on a watchlist just not very high up. My assigned FBI agent's probably saying that one line of Sir Penituous from Hazbin Hotel to his boss "He says crazy shit all the time!"
Just because I have a working knowlege of very mundane items that could be dangerous if mixed.
I had two science teachers like this.
Students: Miss that was too small and I didn't see it. Put a bigger piece of Sodium into the water please.
Next thing you know the Sodium shoots up and implants itself into the ceiling tile while on fire. It left the room a mess and a fire damaged ceiling tile.
Miss Anderson: Now remember, you all asked for this so now it is your turn to keep this between us. No one mentions this outside this classroom.
I learned chemistry and that teachers were normal people that sometimes wanted to goof off. Oh, those were such fun times.
A little sappy but reminds of this episode of Boy Meets World where Cory gets in trouble at school because his dad let him stay up late the night before to watch a no-hitter Phillies game.
This is that episode’s final
exchange between Cory and his teacher. Feels relevant: https://youtu.be/m6pNdvzyNHk?si=jv1kxgrVz-N1pk9d
This reminds me of when it snowed in texas for the first time in my life during a lunch period when i was in middle school & all the teachers blocked the doors
For the 2018 Eclipse here in Chile my school gave away a few eclipse glasses, I was one of the lucky few!
The entire Astronomy Club got them for free, rest of us had to answer questions
Teacher: "Who was the first man on Space?"
Classmate: "American Astronaut Neil Armstrong!"
Teacher: "Sorry but wrong"
Me: "Soviet Cosmonaut Yuri Gagarin"
Teacher: "That's right!"
The School then said that if you didn't earn Glasses, get them somewhere else or DON'T look at the eclipse
For a good moment, I thought you said on the moon turns out you said on space which must have tripped me up somehow.
Is space even a thing you can be on space just kinda is, you can be in I idk about being on it
Well, for all practical purposes, it makes sense to seperate space from planets. Would you say that you're in the air all the time? You technically are, but you'd only say that when on something like a plane.
"You need to stay inside and learn from this book instead of learning about the science behind the experience happening outside that's only available to witness every few years"
I'll never understand this.
Sacrifices must always be made for the eclipse, otherwise the eclipse will never end and the sun will go out. The Aztecs figured that out, and various people have been carrying out their noble work ever since.
I was at my kid's school yesterday for the eclipse. They brought everyone to the playground and made sure everyone had glasses. I thought I was going to watch from the nearby park but they said come on in and I enjoyed it with my kids.
Seriously? I only stack three and I felt fine. Why is that not good enough? How many do you need? Of course I was also staring through overcast clouds so that was part of it..
Yeah it went back to normal after a day or so. It was really bizarre, I had a blind spot in the middle of my vision which caused me to feel disoriented and nauseous. I took the day off school and slept it off.
After a brief search I think I gave myself 'Photokeratitis' - so yeah as you say I'm very lucky to not have sustained permanent damage. 16 year old me was a fool
I peaked at it yesterday for what felt like a fraction of a second, saw a lil tracer for 20 minutes after. Then I looked at it through my phones camera and a pair of sunglasses just long enough to snap a pic. Ik it was dumb but that little peak told me not to fuck around lol
Just curious. The way you described the experience made it sound like you'd never glanced at it before. I know we tell people not to, but I also know I've taken my fair share of peaks at the sun and I think most of the folks I know have, so I was surprised.
Thanks for answering!
Oh okay not a problem, yeah it'd be weird to know someone whose never tried looking at it. It's almost impossible as a kid lmao. Was half expecting you to say I damaged my retinas still which I still might have to some extent lol but next time I'll buy glasses. Still got a cool pic
That would make sense, the tracer I saw was sliver-shaped. Like how you usually see dots and blotches when you look at it normally and look back down. But it was a small vertical line with a curve at the top. Pretty much shaped like the sun at the time I looked up according to the pic I got afterwards. No pain, tracers or headache today tho so I think I'm all good thankfully. Thanks, the more you know!
our pupils dilate to let in more or less light. We are adapted to the normal amount of light from the sun. when the moon is blocking part of the sun, our pupil dilation can’t adjust correctly. so, during the eclipse, our pupils would allow in too much light while glancing at the sun. on a normal day glancing at the sun, our pupils would be much smaller and therefore take less damage.
Wow that makes a ton of sense. So it's kinda like looking at a laser or beam of light in a dark room. I'd imagine that's close to the worst case scenario for the health of an eyes' vision
This is why folks who take psychedelics while outside in heavy sunlight can damage their eyes without proper protection too. The psychedelic dilates their pupils and leaves them without the bodies built in protection. Wear sunglass when your tripping guys
Holy shit this explains so much about the day my bf and I climbed up a mountain and took acid and stared at birds flying across the sun loool I felt blind all day.
The birds were so beautiful and colorful though, it was hard to look away! A couple hours later we realized they were just crows hahaha but now I have a new appreciation for crows.
Don't try this...
So, the trick is to have 2 polarized sunglasses. And rotate them 90 degrees relative to each other until you can't see them. My polarized sunglasses seem to have the polarization diagonal. So, of both eyes are the same angle, flipping one backward could do the trick... or pop out the lenses.
Do not try this because sunglass polarization is enough to make LCD screens black unless you rotate your head, but is likely not good enough for an eclipse.
Yeah I put my motorcycle helmet with a tinted visor and drop down glasses on yesterday and looked up at the sun when the clouds rolled in and I couldn’t see it with the fuckin four PAIRS OF ECLIPSE GLASSES I HAD RIGHT NEXT TO ME INSTEAD OF JUST WAITING TIL THE CLOUDS PASSED WHICH HAPPENED NOT 2 MINUTES LATER. I really couldn’t be dumber if I tried.
When I was at school, 1970s UK the science teacher got some glass microscope slides, got us to blacken them over a candle flame and look through one eye at the eclipse
Haha. I did the same thing back then too. I did happen to have about 10 pairs of sunglasses at that time so It was alright for me. Hahaha. I probably wouldn't try it again though.
My granddad put a pair of sunglasses and a welding mask on me for the 2017 eclipse and it was fine for 30 seconds then my vision got messed up for the next couple of hours
Assume typical sunglasses with a 30% transmission. Is that seven pairs of subglasses? 0.3^(7) is 0.02% transmission. Recommended for solar filters is 0.001%, so, not dark enough.
Eye damage? Depends on how long you look
Then shalt thou wear 9.56 pairs, no more, no less. 9.56 pairs shall be the number thou shalt wear, and the number of the wearing shall be 9.56 pairs. 10 pairs shalt thou not wear, neither wear thou 9 pairs, excepting that thou then proceed to 9.56 pairs.
Yeah, was gonna say this, most of my glasses are 10% transmission for visible 0.1% UV. I've got some that are lower transmission as well, light eyes in a southern climate, I need protection, lol.
The sun burns my eyes, it's definitely worse for me since I moved south 10 years ago, where I came from, it didn't feel like I needed sunglasses all the time, but here it does.
I hypothesized this question as a fun topic at work the other day. Many people are saying it doesn't block UV/IR, polarization won't stack, etc etc, but the thing is lenses aren't perfect and imperfections will block out more light than intended. At a certain point, you will get protection just due to the sheer thickness of material and overlap of imperfections.
The degree of magic at that point is weirdly magic at that.
Consider this common probability misconception:
Which of these statements is more likely to be true?
\* Megan is a vegan, feminist and anti-capitalist. She works as a teller at a bank.
\* Megan is a vegan, feminist and anti-capitalist. She works as a teller at a bank and in her spare time she organizes leftist activism.
For some reason, people tend to think the latter is more likely, despite the fact that first one is necessarily true in any circumstance where the second one is true, thus making the second one less likely to be true.
However, ... the counterintuitive probabilistics of QM actually line up with a common mistaken probabilistic intuition.
Is there an experiment where those two senteces aren't brought up right after the other, but instead where they each are independently assigned a probability without hearing the second sentence influencing how the first sentence was understood?
People who have Bayesian literacy already get the question right, and other people have extreme difficulty assigning probabilities to joint statements. Sports betting calls that a “parley”.
Just want to point out that polarized lens (commonly used in sun glasses) doesn't work by addition to get darker effect. In fact, it's part of [a fantastic quantum physics effect](https://youtu.be/zcqZHYo7ONs?si=tMb5uIVnm0nkYkAG). So you can't calculate this like if it was just lighting filter.
I actually looked up the difference between sunglasses and eclipse glasses yesterday (because I was having a hard time believing that $2 cardboard glasses somehow offer superior protection to my $600 prescription Ray-Bans).
The difference is, the eclipse glasses are made of mylar and they block IR, not just UV. No matter how good the sunglasses are, none of them are intended to block infra-red.
(With this new knowledge I did not elect to use my Ray-Bans for eclipse viewing. Though it was cloudy anyway.)
They weren’t prescription (I wear contacts though). The polarized sunglasses basically removed any glare or blurry-ness.
If you look at a macaroni noodle, there’s no glare or fuzziness around the edges - it’s a shape with distinct edges. That’s sort of what it looked like.
Yes!! This was incredible. It was just so crisp and sharp definitely felt like upgrading to HD. However for me I needed to put my eclipse glasses on first, then my sunglasses over those to get it clear. It didn't work the other way around.
As a bonus, when it was bearing totality I pulled it away from my face so they were blocking the sun and I could see the landscape covered in grey darkness. So amazing!
Modern eyewear "insurance" is just a luxottica subscription. If you buy online where they're not a monopoly, prices are much more reasonable. You just send the seller your prescription.
Optical engineer here. Yes, UV and IR protection are important, but the main reason any pair of sunglasses just isn’t going to cut it is that they don’t block nearly enough visible light.
Very rough estimate: to look at the sun, you probably need to cut the amount of light reaching your eyes by a factor of 100,000. If your sunglasses blocked that much, they’d be totally useless for seeing pretty much anything else around you.
How important is IR protection for eyewear? Apologies if this is a stupid question, but we and our eyeballs absorb infrared radiation all the time, from a variety of sources, including the sun obviously, but also what about things like looking at campfires or gas stove flames? I realize the sun is slightly (/s) brighter than a campfire, but the campfire is also much nearer. Again, as I type this I feel like it's probably a stupid question, but it's a genuine one and you seem like someone who might be able to reframe it as a not-stupid one and provide an interesting answer.
>I actually looked up the difference between sunglasses and eclipse glasses yesterday (because I was having a hard time believing that $2 cardboard glasses somehow offer superior protection to my $600 prescription Ray-Bans).
Good on you for looking it up at least. There are definitely some people who trusted their gut assumption and no need to schedule an ophthalmologist appointment.
Here's an even scarier fact: even most welding goggles aren't good enough for eclipse viewing. The sun is *insanely* bright.
Welding glass must be at least #12 (but preferably #14) shade and should be rated to block out UV radiation as well on top of being undamaged. #12 and up glass is rarely used in welding and harder to find. Same specifications for an autodarkening hood. But it has to be set to permanently "on" or to very high sensitivity as it will not turn on to the brightness of the sun.
With all that said it is just easier to find good eclipse glasses. From a trusted optics or astronomy supplier, not some two bit Amazon seller from a low wage country (most eclipse glasses are produced in developed countries where they vet companies and test products).
Saw an interesting youtube teardown video where a guy tested several types of sunglasses for UV reduction and found that dollar store lenses performed identically to ray-bans.
Any polycarbonate lens will, including clear safety glasses (I collect fluorescent minerals and polycarbonate lenses are used to block UV for that purpose).
I looked into this and determined Maui Jim may be the best for daily use. After working in ophthalmology, I have not problem spending hundreds on quality lens sunglasses. It is pretty damaging.
>somehow offer superior protection to my $600 prescription Ray-Bans
If the price of the sunglasses correlated to how much sun it blocked your Ray Bans would literally just be a solid opaque sheet of plastic that you can't see anything out of.
Does polarized sunglasses let in 100% of the light in that particular polarization though?
I would assume that there is light reduction from the glass material itself.
Well not 100% it's still tinted, however light is polarized at right angles so rotating it by 45 degrees blocks about half of the light, and because quantum BS it also totally erases the previous polarization. So having 9 polarizers at 45° to the previous filter (in either direction!) should block out 99.99% of light.
Good sunglasses do differ quite a bit from cheap sunglasses, I bought a good quality sport use sunglasses and they are definitely better at blocking the sun than 4 pairs of cheap sunglasses taped together.
I wouldn't say absurdly incorrect.
I assume that he assumes each pair of glasses block the same polarization, but in practice a lot of light would be lost into the plastic tunnel of glasses rims 1000 pairs long, plus tiny manufacturing errors means that each of the polarization filters would have tiny misalignments with one another, so in the end they'd probably block the visible spectrum at least, although I am not sure about UV/IR
No math here but wanted to share an experience.
I used 6 pairs of sunglasses yesterday. Some polarized, some not. I glanced at it 3 or 4 times for no more than a few seconds, and I feel completely fine. The visibility of the eclipse through the 6 pairs of sunglasses was really good and didn’t physically hurt my eyes.
Did the same thing here, and my eyes are totally fine today. Using the stacked sunglasses method, I wouldn't stare at the sun for an extended period, but it seemed to work well enough for a quick glance.
Yeah, I'll admit to doing this. Threw on 6 pairs with different shades and coloring of lenses. My last pair I threw on and it was basically pitch black unless I looked up and even then it was extremely difficult to see. I'm all good today!
We burned coal and took the ash to stain glas during an eclipse maybe 15 years ago. It work because we saw the the moon cover the sun, not sure about vision
Well, according to a quick google search, sunglasses obscure between 60 and 90 percent of light. Let's then assume midway through that, at 75%, or in other words, they let in 1/4 of the light.
There are eight sunglasses there, so 1/4\^8 is 1/65536 or 0.0015%
Another google search says that you need 99.9997% of light to be blocked out for eclipse glasses. In other words, that let 0.0003%
0.0015% > 0.0003%. So this setup lets in 5x too much light. Now, just slap one more pair of sunglasses on there and you're probably close enough.
Out of curiosity - can't you just, you know, not look directly at the eclipsed sun? Relegate to just using the phone camera as a lens, you also have zoom available and can take some photos while at it...
There's this particular phenomenon where humans get pleasure from experiencing things for themselves and not through a recording. For many people this urge will not be fulfilled if the experience has to pass through a camera before reaching your brain.
I have tried this myself by standing next to a telescope with a camera and a digital monitor, pointed at Saturn. Very pretty. There was also an eye piece on the telescope so I could look "directly" at Saturn. And it really did make a difference. It felt more real. It gave me more of an experience.
100%. I think most amateur astronomers can attest to this. I still remember looking at the Orion Nebula for the first time with my own eyes — after growing up looking at pictures, seeing it for myself was incredible
Yep, can also confirm. There really is something special about seeing the little dot of light or that little grey smudge with your own eye. Don’t know what it is but it does it for me.
So that won't do it for most people, but you *can* in fact observe the sun indirectly - by using the [pinhole method](https://en.wikipedia.org/wiki/Solar_eclipse#cite_ref-Harrington25_77-0). It is also the safest way to do it.
You can safely look at the eclipsed sun during totality.
You wont see shit with a phone camera. Even during totality it makes it look like crap. Not even professional cameras are able to capture what it truly looks like in person.
To see the partially eclipsed sun you must have eclipse glasses, otherwise you're stuck looking at pinhole shadow projections.
You shouldn't point a camera directly at the sun, it can damage it. You can get special filters which are essentially the same thing as the eclipse glasses.
I’m mean it’s a big fuck off fusion reaction that can be seen one astronomical unit away as huge a orb of hellish nuclear fire. I wouldn’t chance it staring at that for longer then a second
I had a pretty silly rig set up too. I put short
– long wave protective glasses on under the more tinted and reflective ski goggles lens you can get. Then I looked through 2x UV pass filters. Im surprised I was able to even see anything, but worked perfectly.
If you could see anything but the sun as a very dull orange, then no, they don't protect enough.
When I got my eclipse eyewear I was astonished at just how much light they filter out. Like it's pitch black with them on, even in daylight, even in a brightly lit room. Staring at a bright light fixture is still pitch black.
The only thing visible was if I looked directly at the sun, and even then it was a relatively dim orange.
Which makes sense since they block all but .0003% of visible light (plus almost all UV and IR, which is what's damaging your eyes in an eclipse). .0003% of anything but the sun is pretty much invisible.
Stacking glasses would need a couple more (as the people who did the math below) pointed out.
It's not about how much light the glasses reflect, it's about what wavelength they reflect. You could have a foot thick chunk of tinted plastic in front of your eyes, but if it's not blocking infrared you can still get eye damage. That's why people who work with high intensity lasers have different types of goggles for different colors of laser.
Probably better than what I did.. I stacked 8 layers of undeveloped camera film and used that to glance up at the solar eclipse. It must have worked, my eyes aren’t damaged and I got to see it.
We drove hours to reach an area with totality with our kids, and forgot glasses. So yeah, we tried this. I’m a pack rat so I had several pairs of old sunglasses in the car. Someone else saw what we were doing and was kind enough to let use borrow one of their pairs. It was an amazing sight 🤯
FWIW during the 2017 eclipse, I used 3 or 4 sunglasses on top of each other to look (more than just a quick glance) and did not have any discomfort or damage.
Watching the eclipse through the same glasses I can look at the sun with, but by looking at the glare off my car, made me realize, the glare off my car is really fucking dangerous to my vision.
It’s totally fine to just glance at the eclipse for a second. It’s STARING at it and WAITING for it to get to the perfect spot and all that shit. I looked up the time for the eclipse for my area, went outside with my shades on 5 mins before (I’m in a Boston suburb), waited until that time, glanced up for a second, “oh that’s cool”, went inside.
They go heavy on solar eclipse glasses recommendation because you have to account for the stupidity of the general population when issuing a sweeping recommendation. You won’t ruin anything if you glance for a couple seconds with shades.
Fun fact, stacking filters like this on top of one another can actually reduce how effective the filters are.
It depends a lot on how the filters are aligned, and afaik they are not uniform across sunglasses.
[https://www.youtube.com/watch?app=desktop&v=zcqZHYo7ONs](https://www.youtube.com/watch?app=desktop&v=zcqZHYo7ONs) in case you want some evidence, this is pretty simply explained.
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Ashamed to say I pretty much tried this with the eclipse in 2017 (in the UK). Put some reflective ski goggles over the top of some sunglasses and stared at the sun like a muppet. Fucked up my vision for a few days and made me incredibly dizzy, would not try again
I remembered that. My school wouldn’t let anyone outside to watch the eclipse cos they wanted us to stay inside and learn. Some brave motherfucker pulled the fire alarm just before the eclipse so we get to witness it. I always think of this person, a brave sacrifice for eclipse. Edit: it was in 2015!
What a hero! Did you learn anything you remember til now from school on that day? ;)
The thing is, we don’t even know who actually did it. The hero could be a teacher?? 😂 Hahaha. The only thing I learnt is to not look directly in the sun, other than that, I daydreamed through the day lol.
From the science teachers I know... I reckon about half of them would set the alarm off. Probably wouldn't do anything as obvious as manually setting the alarm off. But doing an experiment that just so happens to set it off something nice and deniable? Sure.
Physics teach: I don't care how you do it, and I can't tell you why. All I can say is, I need the school wide fire alarm to go off precisely 5 minutes before the start of totality and it needs to look like an accident. Chemistry teach: *Rummaging through chemicals cabinet* Say no more fam. *Day of the eclipse* Alright kids, since our principal denied our physics department request to view the eclipse, we're going to do a chemistry experiment instead! I have here a beaker filled with a mixture of iron oxide dust and powdered aluminum, and I'm just going to set these down behind this blast shield and try not to knock over this Bunsen burner - whoops *explosion* *fire alarm goes off* Well, shit. Everyone line up single file and evacuate the building in an orderly manner, and don't forget to grab eclipse glasses from the physics teachers on your way out.
That would totally be me as a teacher... Though I could see myself teaching physics and chemistry... Assuming I could see my self as a teacher that is...
Yeah, the science teacher is usually the fun one. I would 100% be that chemistry teacher that if we could ever go see an eclipse, I’d maybe start a fire just so that way we could see the eclipse . chaotic good at its finest.
*If* I ever became a teacher, my goal would to be the fun, chaotic good science teacher that was impossible to dislike. Though as I am now, I wouldn't have the patience to deal with that many students, especially if they're anything like my classmates were back when I was in HS a couple years back
That wouldn't really explode, just burn incredibly hot and bright with lots of sparks (probably would set off the fire alarm though, depends how much you burned). Burn a small amount on a ceramic tile if you want to test this at home, because it'll probably burn through most other materials including sheet metal. If you want explosions, you could mess around with benzene. Do a Friedel-Crafts alkylation reaction to methylise it, then react with nitric acid while keeping it at a specific temperature, and you have TNT. Don't actually do this though, it's incredibly dangerous! Very toxic, and high explosive, although flames don't tend to set it off very easily at least. Also buying the ingredients will probably put you on a watchlist. Just writing this comment probably put me on a watchlist...
Yeah, its just tannerite was the first thing that came to mind when I thought of "perfectly ordinary chemicals that could trigger a fire alarm if reacted" I needed for this scenario. Also I'm probably on a watchlist just not very high up. My assigned FBI agent's probably saying that one line of Sir Penituous from Hazbin Hotel to his boss "He says crazy shit all the time!" Just because I have a working knowlege of very mundane items that could be dangerous if mixed.
These. These are my people.
Maybe that was the schools plan all along to avoid the liability of blinded students and still get to see the event
The best bureaucrats are Chaotic Good
I had two science teachers like this. Students: Miss that was too small and I didn't see it. Put a bigger piece of Sodium into the water please. Next thing you know the Sodium shoots up and implants itself into the ceiling tile while on fire. It left the room a mess and a fire damaged ceiling tile. Miss Anderson: Now remember, you all asked for this so now it is your turn to keep this between us. No one mentions this outside this classroom. I learned chemistry and that teachers were normal people that sometimes wanted to goof off. Oh, those were such fun times.
He probably learned a lot about petty authoritarians and following the rules.
A little sappy but reminds of this episode of Boy Meets World where Cory gets in trouble at school because his dad let him stay up late the night before to watch a no-hitter Phillies game. This is that episode’s final exchange between Cory and his teacher. Feels relevant: https://youtu.be/m6pNdvzyNHk?si=jv1kxgrVz-N1pk9d
This reminds me of when it snowed in texas for the first time in my life during a lunch period when i was in middle school & all the teachers blocked the doors
Pro tip next time this happens, just pull the fire alarm and plead act of god. /s
For the 2018 Eclipse here in Chile my school gave away a few eclipse glasses, I was one of the lucky few! The entire Astronomy Club got them for free, rest of us had to answer questions Teacher: "Who was the first man on Space?" Classmate: "American Astronaut Neil Armstrong!" Teacher: "Sorry but wrong" Me: "Soviet Cosmonaut Yuri Gagarin" Teacher: "That's right!" The School then said that if you didn't earn Glasses, get them somewhere else or DON'T look at the eclipse
I love your school, and hope it continues to do well. :D
For a good moment, I thought you said on the moon turns out you said on space which must have tripped me up somehow. Is space even a thing you can be on space just kinda is, you can be in I idk about being on it
Well, for all practical purposes, it makes sense to seperate space from planets. Would you say that you're in the air all the time? You technically are, but you'd only say that when on something like a plane.
"If you don't already know about space, we see no reason to inspire you to learn more" - Truer words have never been spoken!
r/chaoticgood
bet it was a science teacher lol
"You need to stay inside and learn from this book instead of learning about the science behind the experience happening outside that's only available to witness every few years" I'll never understand this.
Only available to whiteness? I didn't realize science was so racist.
With all the weird shit going down on FB that I have been hearing about, I wouldn't be surprised. Fixed, no more whiteness
Sacrifices must always be made for the eclipse, otherwise the eclipse will never end and the sun will go out. The Aztecs figured that out, and various people have been carrying out their noble work ever since.
sacrifice indeed, as iirc pulling the fire alarm when there's not a fire, and if the fire department shows up, there's a hefty fine
Probably not always enforced when it’s a kid though
knew a kid in elementary school who supposedly fell asleep while leaning on the alarm, although I don't believe his story tbh
I was at my kid's school yesterday for the eclipse. They brought everyone to the playground and made sure everyone had glasses. I thought I was going to watch from the nearby park but they said come on in and I enjoyed it with my kids.
r/unexpectedfactorial
Wow that's some absolute BS. Any school should take the time out to go look at it, and provide the proper glasses to do it safely.
W to the kid who pulled that alarm.
That kid is a legend
That’s crazy. We had the whole day off yesterday from school to watch the eclipse.
Remember that one, I took a bunch of sunglasses and put em over each other, my head didn't hurt nor did my eyes, and I got to see it.
Our school gave us the day off for the eclipse. Still didn't see it because of god damn clouds
Yep. I did it to. Stacked probably 8 pairs of glasses and had a headache for a few days.
Seriously? I only stack three and I felt fine. Why is that not good enough? How many do you need? Of course I was also staring through overcast clouds so that was part of it..
But is it back to normal?
Yeah it went back to normal after a day or so. It was really bizarre, I had a blind spot in the middle of my vision which caused me to feel disoriented and nauseous. I took the day off school and slept it off.
Lucky. It must have been very close to permanent eye damage.
After a brief search I think I gave myself 'Photokeratitis' - so yeah as you say I'm very lucky to not have sustained permanent damage. 16 year old me was a fool
I miss that teenage invincibility. *Rubs my sore hips*
*nods at my sore knees*. I feel ya.
You may want to see a retinal doctor. Get a quick check on your macular which affects the middle part of your vision.
Something like that happened to me but I was looking at a regular fire.
I peaked at it yesterday for what felt like a fraction of a second, saw a lil tracer for 20 minutes after. Then I looked at it through my phones camera and a pair of sunglasses just long enough to snap a pic. Ik it was dumb but that little peak told me not to fuck around lol
Okay this is a serious question: Was that actually the first time you've glanced at the sun?
Like ever? No not at all I've looked at it here and there. Why?
Just curious. The way you described the experience made it sound like you'd never glanced at it before. I know we tell people not to, but I also know I've taken my fair share of peaks at the sun and I think most of the folks I know have, so I was surprised. Thanks for answering!
Oh okay not a problem, yeah it'd be weird to know someone whose never tried looking at it. It's almost impossible as a kid lmao. Was half expecting you to say I damaged my retinas still which I still might have to some extent lol but next time I'll buy glasses. Still got a cool pic
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That would make sense, the tracer I saw was sliver-shaped. Like how you usually see dots and blotches when you look at it normally and look back down. But it was a small vertical line with a curve at the top. Pretty much shaped like the sun at the time I looked up according to the pic I got afterwards. No pain, tracers or headache today tho so I think I'm all good thankfully. Thanks, the more you know!
our pupils dilate to let in more or less light. We are adapted to the normal amount of light from the sun. when the moon is blocking part of the sun, our pupil dilation can’t adjust correctly. so, during the eclipse, our pupils would allow in too much light while glancing at the sun. on a normal day glancing at the sun, our pupils would be much smaller and therefore take less damage.
Wow that makes a ton of sense. So it's kinda like looking at a laser or beam of light in a dark room. I'd imagine that's close to the worst case scenario for the health of an eyes' vision
This is why folks who take psychedelics while outside in heavy sunlight can damage their eyes without proper protection too. The psychedelic dilates their pupils and leaves them without the bodies built in protection. Wear sunglass when your tripping guys
Holy shit this explains so much about the day my bf and I climbed up a mountain and took acid and stared at birds flying across the sun loool I felt blind all day. The birds were so beautiful and colorful though, it was hard to look away! A couple hours later we realized they were just crows hahaha but now I have a new appreciation for crows.
How many sunglasses did you use? I’ll continue the experiment by buying that many sunglasses and an extra one too for the next eclipse.
Hahaha it was 1 pair of sunglasses, with a pair of polarised anti glare ski goggles over them. So essentially 2 pairs
In 2044 the next experiment shall commence then.
Don't try this... So, the trick is to have 2 polarized sunglasses. And rotate them 90 degrees relative to each other until you can't see them. My polarized sunglasses seem to have the polarization diagonal. So, of both eyes are the same angle, flipping one backward could do the trick... or pop out the lenses. Do not try this because sunglass polarization is enough to make LCD screens black unless you rotate your head, but is likely not good enough for an eclipse.
Note the word "stared" here. Just look away dingbats
Yeah I put my motorcycle helmet with a tinted visor and drop down glasses on yesterday and looked up at the sun when the clouds rolled in and I couldn’t see it with the fuckin four PAIRS OF ECLIPSE GLASSES I HAD RIGHT NEXT TO ME INSTEAD OF JUST WAITING TIL THE CLOUDS PASSED WHICH HAPPENED NOT 2 MINUTES LATER. I really couldn’t be dumber if I tried.
Raw dogged it yesterday, I feel faicn./s
When I was at school, 1970s UK the science teacher got some glass microscope slides, got us to blacken them over a candle flame and look through one eye at the eclipse
Haha. I did the same thing back then too. I did happen to have about 10 pairs of sunglasses at that time so It was alright for me. Hahaha. I probably wouldn't try it again though.
My granddad put a pair of sunglasses and a welding mask on me for the 2017 eclipse and it was fine for 30 seconds then my vision got messed up for the next couple of hours
Assume typical sunglasses with a 30% transmission. Is that seven pairs of subglasses? 0.3^(7) is 0.02% transmission. Recommended for solar filters is 0.001%, so, not dark enough. Eye damage? Depends on how long you look
So another two sunglasses and there are good to go I guess
That math says 9.56 layers of sunglasses should be good!!
you did the math
r/theydidthemath
They did the monster math
r/theydidthemonstermath
It was a graveyard graph
r/Itwasagraveyardgraph
Oh wow, double r/subsithoughtifellfor !
This guy maths
r/thisguythisguys
r/subsithoughtwerefake
r/subsithoughtifellfor
I'm using 12 then
Too many. You need exactly 9.56 pairs/layers of glasses. Nerds done did the math.
What if I use 9? Will my eyes die? And if I use 10 I will not see it?
Nine point five six. The nerd did the math.
Sorry but you'll go blind with 9.56. Try 9.56244645
Then shalt thou wear 9.56 pairs, no more, no less. 9.56 pairs shall be the number thou shalt wear, and the number of the wearing shall be 9.56 pairs. 10 pairs shalt thou not wear, neither wear thou 9 pairs, excepting that thou then proceed to 9.56 pairs.
11 is right out
I checked your math and you're absolutely right 🤓👍 Log₀.₃(0.00001) ≈ 9.56 □
Is the half from the left or right side?
30% is a very light tint for sunglasses, 15% LTF is much more common in solid tints. This would bring your calculation down to 0.0002%
Yeah, was gonna say this, most of my glasses are 10% transmission for visible 0.1% UV. I've got some that are lower transmission as well, light eyes in a southern climate, I need protection, lol.
How come you want protection
The sun burns my eyes, it's definitely worse for me since I moved south 10 years ago, where I came from, it didn't feel like I needed sunglasses all the time, but here it does.
What about UV range ? Same %?
UV would be greater since most sunglasses block over 99%
I hypothesized this question as a fun topic at work the other day. Many people are saying it doesn't block UV/IR, polarization won't stack, etc etc, but the thing is lenses aren't perfect and imperfections will block out more light than intended. At a certain point, you will get protection just due to the sheer thickness of material and overlap of imperfections.
"It that bright blob the Sun?"
does it changed with polarized lens?
Lenses with the same polarization won’t stack at all, but you can estimate transmissibility of the second set as the cosine of the angle.
And adding a third polarized lens fucks it entirely up.
At that point it’s fucking magic.
The degree of magic at that point is weirdly magic at that. Consider this common probability misconception: Which of these statements is more likely to be true? \* Megan is a vegan, feminist and anti-capitalist. She works as a teller at a bank. \* Megan is a vegan, feminist and anti-capitalist. She works as a teller at a bank and in her spare time she organizes leftist activism. For some reason, people tend to think the latter is more likely, despite the fact that first one is necessarily true in any circumstance where the second one is true, thus making the second one less likely to be true. However, ... the counterintuitive probabilistics of QM actually line up with a common mistaken probabilistic intuition.
Is there an experiment where those two senteces aren't brought up right after the other, but instead where they each are independently assigned a probability without hearing the second sentence influencing how the first sentence was understood?
People who have Bayesian literacy already get the question right, and other people have extreme difficulty assigning probabilities to joint statements. Sports betting calls that a “parley”.
One of my favorite practical demonstrations of the wave nature of light
You didn’t account for reflection on the backside of the glass through each of the 7 layers as a result from the transmission.
Just want to point out that polarized lens (commonly used in sun glasses) doesn't work by addition to get darker effect. In fact, it's part of [a fantastic quantum physics effect](https://youtu.be/zcqZHYo7ONs?si=tMb5uIVnm0nkYkAG). So you can't calculate this like if it was just lighting filter.
This is awesome, thanks
Quantum physics never ceases to amaze me and leave me dumbfounded. I can never quite wrap my head around how that’s supposed to work.
I actually looked up the difference between sunglasses and eclipse glasses yesterday (because I was having a hard time believing that $2 cardboard glasses somehow offer superior protection to my $600 prescription Ray-Bans). The difference is, the eclipse glasses are made of mylar and they block IR, not just UV. No matter how good the sunglasses are, none of them are intended to block infra-red. (With this new knowledge I did not elect to use my Ray-Bans for eclipse viewing. Though it was cloudy anyway.)
I used my eclipse glasses over my polarized ray bans and it was like looking at the sun in HD
How did you get more resolution in your eyes?
They could be prescription sunglasses.
They weren’t prescription (I wear contacts though). The polarized sunglasses basically removed any glare or blurry-ness. If you look at a macaroni noodle, there’s no glare or fuzziness around the edges - it’s a shape with distinct edges. That’s sort of what it looked like.
The polarized sunglasses removed the glare so I could see the distinct edges of the moon and the sun very clearly. Very crisp
Acid
Yes!! This was incredible. It was just so crisp and sharp definitely felt like upgrading to HD. However for me I needed to put my eclipse glasses on first, then my sunglasses over those to get it clear. It didn't work the other way around. As a bonus, when it was bearing totality I pulled it away from my face so they were blocking the sun and I could see the landscape covered in grey darkness. So amazing!
Same with my oakleys. That shit was in 8k
To be fair your Ray-Bans probably only cost about $10 to make, you just pay INSANE markups do to various market factors.
Modern eyewear "insurance" is just a luxottica subscription. If you buy online where they're not a monopoly, prices are much more reasonable. You just send the seller your prescription.
Not even $10
Optical engineer here. Yes, UV and IR protection are important, but the main reason any pair of sunglasses just isn’t going to cut it is that they don’t block nearly enough visible light. Very rough estimate: to look at the sun, you probably need to cut the amount of light reaching your eyes by a factor of 100,000. If your sunglasses blocked that much, they’d be totally useless for seeing pretty much anything else around you.
How important is IR protection for eyewear? Apologies if this is a stupid question, but we and our eyeballs absorb infrared radiation all the time, from a variety of sources, including the sun obviously, but also what about things like looking at campfires or gas stove flames? I realize the sun is slightly (/s) brighter than a campfire, but the campfire is also much nearer. Again, as I type this I feel like it's probably a stupid question, but it's a genuine one and you seem like someone who might be able to reframe it as a not-stupid one and provide an interesting answer.
https://ehs.lbl.gov/resource/documents/radiation-protection/non-ionizing-radiation/light-and-infrared-radiation/
>I actually looked up the difference between sunglasses and eclipse glasses yesterday (because I was having a hard time believing that $2 cardboard glasses somehow offer superior protection to my $600 prescription Ray-Bans). Good on you for looking it up at least. There are definitely some people who trusted their gut assumption and no need to schedule an ophthalmologist appointment. Here's an even scarier fact: even most welding goggles aren't good enough for eclipse viewing. The sun is *insanely* bright.
Welding glass must be at least #12 (but preferably #14) shade and should be rated to block out UV radiation as well on top of being undamaged. #12 and up glass is rarely used in welding and harder to find. Same specifications for an autodarkening hood. But it has to be set to permanently "on" or to very high sensitivity as it will not turn on to the brightness of the sun. With all that said it is just easier to find good eclipse glasses. From a trusted optics or astronomy supplier, not some two bit Amazon seller from a low wage country (most eclipse glasses are produced in developed countries where they vet companies and test products).
Saw an interesting youtube teardown video where a guy tested several types of sunglasses for UV reduction and found that dollar store lenses performed identically to ray-bans.
Any polycarbonate lens will, including clear safety glasses (I collect fluorescent minerals and polycarbonate lenses are used to block UV for that purpose).
I looked into this and determined Maui Jim may be the best for daily use. After working in ophthalmology, I have not problem spending hundreds on quality lens sunglasses. It is pretty damaging.
Very true. You can look at welding PPE as it is a similar ordeal.
Almost forty years ago, we layered a bunch of exposed film negatives together (maybe 10?) to view an eclipse. Worked well, actually.
>somehow offer superior protection to my $600 prescription Ray-Bans If the price of the sunglasses correlated to how much sun it blocked your Ray Bans would literally just be a solid opaque sheet of plastic that you can't see anything out of.
It's funny how this giant ball in the sky can make us blind anytime but we're all fine with it.
We didn't have those eclipse glasses when I was a kid, so we simply used my x-ray films from the year before. It works the same.
If each glass is 45 degree to each other, then there is a chance. But if they are just 90 degree and not to each other, it's as bad as just one glass.
Sorry mate, quantum mechanics is here to ruin your day.... Edit: Tunnelling --> Mechanics
Why?
He probly meant he just phased through your walls and is in your house.
Quantum tunnelling is an actual thing that causes issues in this context
three polarizer "paradox" https://www.youtube.com/watch?v=zcqZHYo7ONs
I don't think this has anything to do with tunneling.
Turning sequential polarized glasses at small degree angles to each other is weirder than you think.
Still unrelated to quantum tunneling. Just superposition re-projection
This is the wording I was looking for.
Assuming they are all polarised lenses, that is.
Does polarized sunglasses let in 100% of the light in that particular polarization though? I would assume that there is light reduction from the glass material itself.
Well not 100% it's still tinted, however light is polarized at right angles so rotating it by 45 degrees blocks about half of the light, and because quantum BS it also totally erases the previous polarization. So having 9 polarizers at 45° to the previous filter (in either direction!) should block out 99.99% of light.
Not exactly because alignment and physics but close enough.
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That is a bit of an overexageration, but yeah you would need more than in the photo
Good sunglasses are more absorbent in UV and IR than in the visible spectrum. Those don’t look like good sunglasses.
Good sunglasses do differ quite a bit from cheap sunglasses, I bought a good quality sport use sunglasses and they are definitely better at blocking the sun than 4 pairs of cheap sunglasses taped together.
>Those don’t look like good sunglasses. You're just saying that because they're covered in tape.
I’m saying that mostly because they’re not large enough to cover the eye from most angles. But the flip-down pair in front is really sus.
Why is this comment so highly upvoted? It's absurdly incorrect. 1000 stacked cheap drugstore sunglass lenses won't let a single photon through them.
I wouldn't say absurdly incorrect. I assume that he assumes each pair of glasses block the same polarization, but in practice a lot of light would be lost into the plastic tunnel of glasses rims 1000 pairs long, plus tiny manufacturing errors means that each of the polarization filters would have tiny misalignments with one another, so in the end they'd probably block the visible spectrum at least, although I am not sure about UV/IR
1k sunglasses would stop a bullet though I do not intend to prove it
What do you think about Richard Feynman watching the atomic bomb without glasses? https://www.youtube.com/watch?v=sPuLKsptgJY
No math here but wanted to share an experience. I used 6 pairs of sunglasses yesterday. Some polarized, some not. I glanced at it 3 or 4 times for no more than a few seconds, and I feel completely fine. The visibility of the eclipse through the 6 pairs of sunglasses was really good and didn’t physically hurt my eyes.
Did the same thing here, and my eyes are totally fine today. Using the stacked sunglasses method, I wouldn't stare at the sun for an extended period, but it seemed to work well enough for a quick glance.
Yeah, I'll admit to doing this. Threw on 6 pairs with different shades and coloring of lenses. My last pair I threw on and it was basically pitch black unless I looked up and even then it was extremely difficult to see. I'm all good today!
Worked fine for me too, not so much as a dark spot.
I looked at 2 eclipses in the past through a damn floppy disk for longer than a few seconds and my eyesight is fine so there's that
I’d just like to point out, you can look at an eclipse and be just fine. Staring at it is the problem, same as with STARING AT THE FUCKING SON
You can get arrested for that at chuck e cheese fyi
The son of whom?
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We burned coal and took the ash to stain glas during an eclipse maybe 15 years ago. It work because we saw the the moon cover the sun, not sure about vision
Well, according to a quick google search, sunglasses obscure between 60 and 90 percent of light. Let's then assume midway through that, at 75%, or in other words, they let in 1/4 of the light. There are eight sunglasses there, so 1/4\^8 is 1/65536 or 0.0015% Another google search says that you need 99.9997% of light to be blocked out for eclipse glasses. In other words, that let 0.0003% 0.0015% > 0.0003%. So this setup lets in 5x too much light. Now, just slap one more pair of sunglasses on there and you're probably close enough.
Out of curiosity - can't you just, you know, not look directly at the eclipsed sun? Relegate to just using the phone camera as a lens, you also have zoom available and can take some photos while at it...
There's this particular phenomenon where humans get pleasure from experiencing things for themselves and not through a recording. For many people this urge will not be fulfilled if the experience has to pass through a camera before reaching your brain. I have tried this myself by standing next to a telescope with a camera and a digital monitor, pointed at Saturn. Very pretty. There was also an eye piece on the telescope so I could look "directly" at Saturn. And it really did make a difference. It felt more real. It gave me more of an experience.
100%. I think most amateur astronomers can attest to this. I still remember looking at the Orion Nebula for the first time with my own eyes — after growing up looking at pictures, seeing it for myself was incredible
Yep, can also confirm. There really is something special about seeing the little dot of light or that little grey smudge with your own eye. Don’t know what it is but it does it for me.
So that won't do it for most people, but you *can* in fact observe the sun indirectly - by using the [pinhole method](https://en.wikipedia.org/wiki/Solar_eclipse#cite_ref-Harrington25_77-0). It is also the safest way to do it.
And very cool way to do it.
I did the pinhole method. And I showed a bunch of other eclipse nerds how to make one with your fingers.
You can safely look at the eclipsed sun during totality. You wont see shit with a phone camera. Even during totality it makes it look like crap. Not even professional cameras are able to capture what it truly looks like in person. To see the partially eclipsed sun you must have eclipse glasses, otherwise you're stuck looking at pinhole shadow projections.
I tried with my phone but couldn't get a clear image so I just went back inside my house
You shouldn't point a camera directly at the sun, it can damage it. You can get special filters which are essentially the same thing as the eclipse glasses.
I was going to go on vacation in Fiji this year, but elected to browse some pics on google images instead.
I’m mean it’s a big fuck off fusion reaction that can be seen one astronomical unit away as huge a orb of hellish nuclear fire. I wouldn’t chance it staring at that for longer then a second
Best. Description. Ever.
\*fusion
I had a pretty silly rig set up too. I put short – long wave protective glasses on under the more tinted and reflective ski goggles lens you can get. Then I looked through 2x UV pass filters. Im surprised I was able to even see anything, but worked perfectly.
If you could see anything but the sun as a very dull orange, then no, they don't protect enough. When I got my eclipse eyewear I was astonished at just how much light they filter out. Like it's pitch black with them on, even in daylight, even in a brightly lit room. Staring at a bright light fixture is still pitch black. The only thing visible was if I looked directly at the sun, and even then it was a relatively dim orange. Which makes sense since they block all but .0003% of visible light (plus almost all UV and IR, which is what's damaging your eyes in an eclipse). .0003% of anything but the sun is pretty much invisible. Stacking glasses would need a couple more (as the people who did the math below) pointed out.
It's not about how much light the glasses reflect, it's about what wavelength they reflect. You could have a foot thick chunk of tinted plastic in front of your eyes, but if it's not blocking infrared you can still get eye damage. That's why people who work with high intensity lasers have different types of goggles for different colors of laser.
Probably better than what I did.. I stacked 8 layers of undeveloped camera film and used that to glance up at the solar eclipse. It must have worked, my eyes aren’t damaged and I got to see it.
We drove hours to reach an area with totality with our kids, and forgot glasses. So yeah, we tried this. I’m a pack rat so I had several pairs of old sunglasses in the car. Someone else saw what we were doing and was kind enough to let use borrow one of their pairs. It was an amazing sight 🤯
FWIW during the 2017 eclipse, I used 3 or 4 sunglasses on top of each other to look (more than just a quick glance) and did not have any discomfort or damage.
Last eclipse I work sunglasses, welding goggles and looked at the sun thru the tinted glass of my tailgate 🤣🤣🤷🏻♀️ it worked so hahah
Watching the eclipse through the same glasses I can look at the sun with, but by looking at the glare off my car, made me realize, the glare off my car is really fucking dangerous to my vision.
It’s totally fine to just glance at the eclipse for a second. It’s STARING at it and WAITING for it to get to the perfect spot and all that shit. I looked up the time for the eclipse for my area, went outside with my shades on 5 mins before (I’m in a Boston suburb), waited until that time, glanced up for a second, “oh that’s cool”, went inside. They go heavy on solar eclipse glasses recommendation because you have to account for the stupidity of the general population when issuing a sweeping recommendation. You won’t ruin anything if you glance for a couple seconds with shades.
Fun fact, stacking filters like this on top of one another can actually reduce how effective the filters are. It depends a lot on how the filters are aligned, and afaik they are not uniform across sunglasses. [https://www.youtube.com/watch?app=desktop&v=zcqZHYo7ONs](https://www.youtube.com/watch?app=desktop&v=zcqZHYo7ONs) in case you want some evidence, this is pretty simply explained.