AST101H1 Lecture Notes - Elliptic Geometry, New Moon, Full Moon
19 Nov 2012
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AST101H1 Full Course Notes
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The earth orbits the sun once every 365 days. (elliptic plane) the earth spins on its axis once every 24 hours. The moon orbits the earth about 12 times a year. New moon the lit side is facing away so we cannot see it. Waxing crescent the right side of the moon starts to illuminate. First quarter waxing gibbous full moon waning gibbous, last quarter . The earth moves opposite to the sun = west to east. It takes about 29 days for the moon to orbit earth.
