Revolution

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Revolution

</dt>
1. Motion of a celestial body in its orbit; circular motion about an axis usually external to the body. </dd>
In some contexts, the terms revolution and rotation are used interchangeably but, with reference to the motions of a celestial body, revolution refers to motion in an orbit or about an axis external to the body, whereas rotation refers to motion about an axis within the body. Thus, the earth revolves about the sun annually and rotates about its axis daily. </dd>
2. One complete cycle of the movement of a celestial body in its orbit, or of a body about an external axis, as a revolution of the earth about the sun. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use