# The Moo6 - would be visible from the Earth as it goes around the Earth One side of the Moon is always facing the Earth since the orbital period is

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The Moon If you still think that the Moon doesn't spin around think about this - if it didn't, we'd see different sides of the Moon, not just always the same view. This is shown in Figure 11. If the Moon did not rotate, it would always have one side pointing in the same direction, as is shown by a line on it. That line would always be pointing in the same direction in space, but on the Earth we would see different sides of the Moon as it goes around the Earth. That's not what we see - we can only see one side of the Moon from the Earth, since that one side is always pointing toward us. Figure 11. The Moon makes one complete orbit in the same amount of time it takes to make one rotation. If it didn't rotate, we'd have the situation on the left, where different sides of the Moon
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Unformatted text preview: would be visible from the Earth as it goes around the Earth. One side of the Moon is always facing the Earth, since the orbital period is the same as the rotation period. The time for it to complete a cycle of phases is 29.5 days. I don't think we can just call it that, can we? No, of course not; we'll have to give it a more "scientific name." We refer to this time as the Synodic Period . This is just the time it takes for the same Earth-Sun-Moon alignments to occur again, so it is the time for the Moon to go from one Full Moon to the next Full Moon, or the time it takes to go from one first quarter moon to the next first quarter moon - either way, it is 29.5 days....
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## This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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