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  #226  
Old 08-30-2017, 04:20 PM
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Default Re: North American Solar eclipse 8/21/2017

I am very skeptical of that story. It's based on an account of something someone supposedly told an unnamed source (so a friend-of-a-friend story, but not even attributed), and it's just a little too jokey.

I'm not saying it's 100% not true, but it has all the earmarks of an urban legend.
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  #227  
Old 08-30-2017, 04:29 PM
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Default Re: North American Solar eclipse 8/21/2017

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  #228  
Old 08-30-2017, 09:57 PM
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Default Re: North American Solar eclipse 8/21/2017

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  #229  
Old 08-30-2017, 11:12 PM
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Default Re: North American Solar eclipse 8/21/2017

Quote:
Originally Posted by ceptimus View Post
of course during a solar eclipse it is the side of the Moon that always faces Earth that is dark. People often use the term 'dark side' to refer to the Moon's far side - the side that faces away from Earth that we never normally see. But here I'm using "dark side" to correctly refer to the side not lit up by the Sun.
There is no dark side of the moon, really. Matter of fact, it’s all dark.
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  #230  
Old 08-31-2017, 01:16 AM
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Default Re: North American Solar eclipse 8/21/2017

I would say that, at any moment in time, half the moon (the side facing away from the sun) is dark - in just the same way that the half the earth facing away from the sun is dark - what we call night.

When the moon is new (as seen from earth) it's between the earth and the sun, so the dark side isn't so very dark as it's lit up by earthlight. When the moon is full (as seen from the earth) then the dark side is very dark - it's only lit up by the starlight and (if they're above the horizon) the outer planets.

So what we correctly call the 'far side' - the side of the moon never seen from earth - does get darker than the near side. Although it's confusing and mostly wrong, there is some slight truth in calling the far side, 'the dark side'.
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  #231  
Old 09-04-2017, 11:32 PM
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Default Re: North American Solar eclipse 8/21/2017

IIRC, the surface of the moon is roughly the color of volcanic ash, dark gray, and about as reflective.
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  #232  
Old 09-05-2017, 12:25 AM
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Default Re: North American Solar eclipse 8/21/2017

Yup. The Moon's average albedo is 0.12; the maria are darker, whereas the lunar uplands are somewhat lighter. Despite the variability, even the "brightest" parts of the Moon's surface are actually rather dark gray in color. (Some of the upland areas have an albedo of 0.16 or so, whereas the maria and the floors of some craters can have albedos down to 0.06 or so.) For comparison, black paint has an albedo of around 0.05, and aged asphalt has an albedo of about 0.1 - 0.12 (freshly-poured asphalt has an albedo of about 0.04 - 0.05). So, on average, the Moon reflects about as much light as does asphalt; it only looks relatively bright because there's nothing else in the night sky that can reflect or emit anywhere near as much light to us.

By contrast, the Earth has an average albedo of about 0.33, but there's a very wide range. Conifer forests have an albedo of around 0.04 - 0.05, while fresh snow has an albedo of 0.8 - 0.9. (That's comparable to the albedo of a mirror, which is generally 0.72 - 0.85.)

Venus' average albedo is an astonishing 0.76, by the way. It reflects light in the visible part of the spectrum better than do many mirrors. (This is because the surface of Venus is completely obscured by highly reflective clouds.)
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  #233  
Old 09-05-2017, 05:11 PM
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Default Re: North American Solar eclipse 8/21/2017

The Moon's apparent brightness was the inspiration of Hanns Hoerbiger's Cosmic Ice Theory, a crackpot cosmology that stated that the Moon is covered with ice.

I could describe it in another thread.
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  #234  
Old 09-14-2017, 12:38 PM
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Default Re: North American Solar eclipse 8/21/2017



APOD: 2017 September 6 - The Climber and the Eclipse
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  #235  
Old 09-14-2017, 12:38 PM
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Default Re: North American Solar eclipse 8/21/2017

And this is p cool. You can mute the sound, just vaguely inspiring music and Japanese-American chatter.


APOD: 2017 September 12 - A Total Solar Eclipse Close Up in Real Time
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  #236  
Old 09-18-2017, 02:22 AM
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Default Re: North American Solar eclipse 8/21/2017

Quote:
Originally Posted by JoeP View Post
That photo is just wrong, there shouldn't be stars visible on the surface of the Moon. Did they photograph the sky before the eclipse and the superimpose the image on the sky with the image of the solar eclipse? The photo is just wrong.
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  #237  
Old 09-18-2017, 03:59 AM
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Default Re: North American Solar eclipse 8/21/2017

According to the website, the photograph was taken in Oregon. I'm guessing that the things that look like stars are actually Cottonwood fluff in the air, or perhaps just random flying insects.

Cottonwoods generally produce their seeds/fluff earlier in the season, but I've often seen significant amounts of it floating about well into August, so I'm guessing that's what it is -- Cottonwood fluff and/or insects backlit by the Sun.
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