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Saturday 20 October 2012

Moon revolves around the earth in an elliptical orbit and its rotation


The average distance of Moon from the Earth is 384400 kilometers.  You can have a better idea of this distance in this that ifa person goes around the earth,  then after having nine and half rounds, he will cover a distance equal to the distance between Moon and the Earth.  The moon is smaller in size than the earth.  The diameter of the Moon is 3480 kilometers and its mass is 81 times less than the earth. Moon revolves around the earth with twenty four hours in an elliptical orbit and its rotation is anticlockwise.  Moon  takes about 27.3 days in completing its one rotation arround the earth. As the Earth is also in motion, hence, it appears to us that Moon completes its rotation in about 29.5 days.


Moon,like earth also revolves about its own axis but its spin motion is comparatively slow.  The time duration in which it completes its one rotation around the earth is the same as that taken by it to complete its spin rotation.  Tha is why, only one side of the Moon alway remains towards the earth.  The other side of the Moon cannot be seen from the earth. Your will be surprised to know that Moon does not have its own light.  It looks bright only because of thereflection of the sunlight from its surface.  As the relfected light is not visible during daytime, therefore, we cannot see the Moon.  On the other hand onlyat night, we can easily see the Moon due to darkness in the sky.

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