Quote:
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Originally Posted by tony873004
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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I calculate that, when the angle from Sun to observer to Moon
is 90 degrees, the difference between the Moon's terminator
and a ball's terminator will be between 0.1 and 0.2 degree,
measured from the center of each.
-- Jeff, in Minneapolis
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http://www.FreeMars.org/jeff/
"I find astronomy very interesting, but I wouldn't if I thought we
were just going to sit here and look." -- "Van Rijn"
"The other planets? Well, they just happen to be there, but the
point of rockets is to explore them!" -- Kai Yeves