And then, of course, there is the ever-popular web searach: csep10.phys.utk.edu...
The Moon appears to go through a complete set of phases as viewed from the Earth because of its motion around the Earth, as illustrated in the
as the moon rotates around its orbital path the sunlight coming from the sun will strike it at different angles creating the phases of the moon. as
for why we always see the same side of the moon, that is because the moon's rotational and orbital period are the same (27.3 days) cancelling out a
visible rotational effect.
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