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Earthshine Refraction and Moon Illusion



Bob Johnson's picture
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Actually I went out just to capture the celestial gathering of Saturn and the Moon, the image below, when by chance I got a cool image of a squashy honking big brown Moon, may not be the proper astronomical terms, but the Moon looked astronomical none the less.

Notice the Moon's flat bottom, this is caused by the refraction of the Moon's light back onto itself from all the dust and water particles in our lower atmosphere, kind of bends the light upwards onto itself. The same particles scatter the blues of the Moonlight and allow the reds through to be seen by us, hence a red brown Moon. Then we have what we call the Moon illusion, because the Moon being so close to the ground, our mind by comparing it to the Earthly surroundings make the Moon seem very large.


The Earthshine is caused by the Sunlight reflecting off the Earth onto the Moon lighting up the Moon's night side, the bright part of the Moon we see in the images is the Sunlight reflecting off the Moon directly to us, what we call Moonlight.

Below are some more Moon with Earthshine images I took on my outing.


Just a reminder if you want to enter the "Find and Photograph The Daytime Moon Contest" now is the time to take your Pics. The Moon will be in it's New Moon Phase tomorrow but will start waxing to larger crescents after that, closing date will be November 3rd, lots of opportunity to get your daytime crescent Moon and maybe even win 50 pairs of Hanna Montana/Miley Cyrus 3D glasses, think of the possibilities, all the 3D parties you could throw, great stocking stuffers, boggles the mind.

I'll leave you now with an animated daytime crescent Moon complete with clouds.