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This mornings moon.


NIGHTBOY

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 Its an optical illusion. When the moon is low down near the horizion it always seems larger than it really is.

Lots of reasons for the "full moon illusion" have been offered, but it seems to arise from the way our brain inteprets the moon in relation to its apparent surroundings (trees and buildings on the ground for a low moon, empty sky for a high one). We see a low full moon as mountain-distance (very big and far away) and a high one as balloon-distance (smaller and nearer). A similar illusion kicks in when we look at planets through a telescope - people see Jupiter as "pea size", even when it has the same angular size as a rising full moon viewed with the naked eye.

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If you have a couple of mins to spare take a look at this

http://stargazerslounge.com/topic/176431-full-moon-silhouette/

Its a big moon...

Very pretty video. The people are subtending approximately an eighth of the moon's apparent diameter, i.e. 3.75 arcmin. If we take a person's height as approximately 6 feet then they must be standing just over 2 miles from the camera. Assuming it's not fake, of course. Certainly makes the moon look very big.

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