Earth's Moon is about 1/ 400th the diameter of the Sun, but it is also 1/ 400th as far from us, making the Sun and the Moon the same size on the sky-a coincidence not shared by any other planet–moon combination in the solar system, allowing for uniquely photogenic total solar eclipses.
( Neil deGrasse Tyson )
[ Astrophysics for People in a ]
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