Read Also:Â Space Exploration from Earth
As mentioned above, just like the earth and the moon also rotates on its own axis. The time taken by the moon to complete one rotation on its axis is also exactly one sidereal month. This fact has an important bearing upon the earth-moon relationship. Consequent to this relationship we always see the same face of the moon from the earth also, we can never see from the earth the complete surface of the moon. Only 59 percent of the total surface of the moon is visible from the earth. The remaining 41 percent is never seen. In fact at any given time at the most 50 percent of the surface of the moon is visible from the earth and another 9 percent can be seen from time to time with shift of the apparent edges of the illuminated part of the moon because of the relative motion (liberations) due to changes in the angle of the view from the earth.
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