Mean Time

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Mean Time

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Time based upon the rotation of the earth relative to the mean sun. </dd>
Mean time may be designated as local or Greenwich as the local or Greenwich meridian is the reference. Greenwich mean time is also called universal time. Zone, standard, daylight saving or summer, and war time are also variations of mean time, specified meridians being used as the reference. Mean time reckoned from the upper branch of the meridian is called astronomical time. Mean time was called civil time in U.S. terminology from 1925 through 1952. See equation of time, mean sidereal time. [[/a>|/a>]] </dd>

References

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