Why does the Moon's terminator not appear orthogonal to the direction of the Sun?

Published 30 Dec 2013 in physics.hist-ph | (1401.0498v2)

Abstract: When the Moon is at quarter, its terminator generally does not appear to be orthogonal to a straight line connecting the Moon with the Sun. A purely geometric, intuitive interpretation of this at first sight puzzling observation is suggested here.

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Alberto De Gregorio

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