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  #21  
Old 26.02.2015, 21:08
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Re: Solar eclipse

I hope it's so ing cloudy after all the preparations.
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  #22  
Old 26.02.2015, 21:57
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Re: Solar eclipse

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I'm holding out for the inverse eclipse in New Zealand, 2042. They're really quite rare - this will be the third in a thousand years - as they involve the moon going behind the sun.

I just hope I'm still alive to see it. Fingers crossed!
Sarcasm?
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  #23  
Old 07.03.2015, 15:13
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Re: Solar eclipse

Less than two weeks to go. Here is another interesting site with details of the eclipse

http://astronomynow.com/2015/03/06/t...solar-eclipse/
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  #24  
Old 07.03.2015, 15:34
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Re: Solar eclipse

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Sarcasm?
Seriously? Think about for it for a moment...
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  #25  
Old 07.03.2015, 15:47
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Re: Solar eclipse

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This is very safe as the harmful rays do not reflect, and children can watch the view too.
This is a really dumb idea. Which "harmful rays" exactly do you think are not reflected?

Try here: http://www.eclipsetours.com/resource...pse-equipment/

(BTW, welcome to my first ever groan. I don't give them lightly.)
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  #26  
Old 07.03.2015, 21:41
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Re: Solar eclipse

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This is a really dumb idea. Which "harmful rays" exactly do you think are not reflected?

Try here: http://www.eclipsetours.com/resource...pse-equipment/

(BTW, welcome to my first ever groan. I don't give them lightly.)
While most of what's written in the link you've provided is useful advice, the individual (with an agenda -- he organises tours to observe the sun) writing it does himself no favours by dismissing an Australian "ophthamologist" (sic) as "irresponsible", claiming that she is "ignorant" or has a "political agenda", because she warned people "not to look at the Sun during totality and during the partial phases of the eclipse even with approved eclipse viewing glasses".

How on earth can advice to abstain from looking at the sun be criticised as "irresponsible"? It seems this tour guide considers himself more knowledgeable about ocular health than ophthalmologists.
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  #27  
Old 07.03.2015, 21:53
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Re: Solar eclipse

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While most of what's written in the link you've provided is useful advice, the individual (with an agenda -- he organises tours to observe the sun) writing it does himself no favours by dismissing an Australian "ophthamologist" (sic) as "irresponsible", claiming that she is "ignorant" or has a "political agenda", because she warned people "not to look at the Sun during totality and during the partial phases of the eclipse even with approved eclipse viewing glasses".

How on earth can advice to abstain from looking at the sun be criticised as "irresponsible"? It seems this tour guide considers himself more knowledgeable about ocular health than ophthalmologists.
These are irrelevant and distracting points; the author isn't recommending any dangerous practices. The real point here is the advice in this thread to observe the sun through water reflection.

The albedo of water at that angle of the sun is likely to be around 10%. How long would you advise somebody (even a child) to stare at 10% of the sun? Please come back with an opinion.
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  #28  
Old 07.03.2015, 21:59
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Re: Solar eclipse

Here's an albino in water, and I'm pretty sure I can see more than 10% of it.

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  #29  
Old 07.03.2015, 22:06
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Re: Solar eclipse

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Here's an albino in water, and I'm pretty sure I can see more than 10% of it.
To me it looks delicious.
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Old 07.03.2015, 23:02
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Re: Solar eclipse

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Here's an albino in water, and I'm pretty sure I can see more than 10% of it.

No you can't, anything above 10% is an optical illusion.
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  #31  
Old 07.03.2015, 23:21
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Re: Solar eclipse

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No you can't, anything above 10% is an optical illusion.
Does that rabbit look blue and black to you?
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  #32  
Old 07.03.2015, 23:39
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Re: Solar eclipse

I stared at it too long without welding glasses, now everything looks blue and black to me.
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  #33  
Old 07.03.2015, 23:40
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Re: Solar eclipse

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Does that rabbit look blue and black to you?
I think I must be 'visually challenged', it just looks wet!
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  #34  
Old 08.03.2015, 11:20
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Re: Solar eclipse

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That would be so incredibly awesome. Hope I am still around too!
moon BEHIND the sun?? help me out here. How does that work
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  #35  
Old 08.03.2015, 14:44
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Re: Solar eclipse

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moon BEHIND the sun?? help me out here. How does that work
Well, you've probably noticed that the moon chases the sun around the earth. It almost never catches up, but when it does it usually goes in front of the sun to cause a solar eclipse. However, on some occasions - not very often, only once every few hundred years - the moon slips behind the sun so you can't see it any more on account of the sun's fiery brilliance. It's not a good idea to look directly at the sun on these occasions and you can't see the moon anyway, so there's no point.

I hope this helps. I understand that not everybody is a expert at cosmolology like I am.
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Old 08.03.2015, 15:12
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Re: Solar eclipse

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...BUT, you could also fill a large wide plastic bowl (or bucket) full up with water, and look at the sun's reflection.
This is very safe as the harmful rays do not reflect, and children can watch the view too.
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This is a really dumb idea. Which "harmful rays" exactly do you think are not reflected?...
Which ones do you think are? UV rays are not well reflected by water. Water itself has a low albedo. It would only be dangerous if the intensity of light reflected was above what the eye can handle.

I've been unable to find any definitive statement that looking at the eclipse via reflection in water is in any way dangerous. Solar astronomer Mitzi Adams says the ancient Chinese used to view eclipses by reflection in water, and does not say this was a dangerous thing to do.

However, I'll stick with projection through a telescope.
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Old 08.03.2015, 15:23
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Re: Solar eclipse

You can also do a pinhole projector with a piece of paper:

http://www.timeanddate.com/eclipse/m...projector.html
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  #38  
Old 09.03.2015, 11:20
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If it's like the one in 1999 it will be thick cloud and you won't need to worry about glasses etc.
I saw this one in Alderney, only place pretty much that had a clear view.

Looked a little like this

http://www.astronomy.org.gg/images/S...019990811b.jpg

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This is a really dumb idea. Which "harmful rays" exactly do you think are not reflected?

Try here: http://www.eclipsetours.com/resource...pse-equipment/

(BTW, welcome to my first ever groan. I don't give them lightly.)
Yes this is very dumb advice (use a bowl of water) , you might as well use a mirror?!@!

Last edited by 3Wishes; 11.03.2015 at 16:30. Reason: merging successive posts
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  #39  
Old 09.03.2015, 11:26
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Re: Solar eclipse

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I saw this one in Alderney, only place pretty much that had a clear view.

Looked a little like this

http://www.astronomy.org.gg/images/S...019990811b.jpg
I was on a visit to England and was buying petrol in Dover where the weather was clear. The mechanics were kind enough to share a welding mask so I had a good view.
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Old 09.03.2015, 12:21
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Re: Solar eclipse

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Which ones do you think are? UV rays are not well reflected by water. Water itself has a low albedo. It would only be dangerous if the intensity of light reflected was above what the eye can handle.

I've been unable to find any definitive statement that looking at the eclipse via reflection in water is in any way dangerous. Solar astronomer Mitzi Adams says the ancient Chinese used to view eclipses by reflection in water, and does not say this was a dangerous thing to do.

However, I'll stick with projection through a telescope.
All wavelengths are reflected by water; the higher frequencies less so. The kind of eye damage (due to heating effects) you get from looking at the sun comes from the most part from the infra-red and visible parts of the spectrum.

The ancients did all sorts of things that we would now consider unsafe and they anyway didn't possess #14 welder's goggles and so took the hit for science (we don't have to do that now).

Even if we take a lower figure for the percentage of light reflected by the water's surface (let's say 3% - 3 parts in a hundred), this is four orders of magnitude higher than what is transmitted through #14 welder's goggles (3 parts in a million). The goggles also more completely block infra-red (and UV).

Looking at the sun through water reflection is similar to looking at the sun directly with normal sunglasses, something I think most sensible people would agree is pretty dumb.
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