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The period of the moon around the Earth, when it took a consistently same position among the stars, in monitoring the land called сидерическим month. He is 27.3 days.Moon rotation around its axis is with constant angular speed in the same direction, in which it is drawn around the Earth. The Moon rotation around the axis equal to period its treatment around the Earth - 27.3 days.It is for this reason that the land we see only one hemisphere, which is referred to as - the visible, and the other, hidden from our eyes - the invisible hemisphere is referred to as reverse side the Moon.
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