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Originally Posted by tony873004
I've always noticed that it is orthogonal. Next time you see the Moon and Sun together in the sky, hold a round ball in front of the Moon. You'll find that the phase of the ball matches that of the Moon. And the terminator on the ball will be orthogonal to the Sun line.
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Do you live near the equator then?
It is certainly not orthogonal for me, round ball or no round ball. If the sun is below the horizon to my left, and the moon's terminator is slanted slightly to the right, which would imply that the sun were slightly higher than the moon in the sky, which it isn't.
clop