Greenwich Mean Time

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Greenwich Mean Time

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Local mean time at the Greenwich meridian; the arc of the celestial equator, or the angle at the celestial pole, between the lower branch of the Greenwich celestial meridian and the hour circle of the mean sun, measured westward from the lower branch of the Greenwich celestial meridian through 24 hours; Greenwich hour angle of the mean sun, expressed in time units, plus 12 hours. Called Greenwich civil time in U.S. terminology from 1925 through 1952. Also called universal time, Z-time. </dd>
Mean time reckoned from the upper branch of the Greenwich meridian is called Greenwich astronomical time. [[/a>|/a>]] </dd>

References

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