Greenwich Apparent Time

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Greenwich Apparent Time

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(abbr GAT) Local apparent 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 apparent or true sun, measured westward from the lower branch of the Greenwich celestial meridian through 24 hours; Greenwich hour angle of the apparent or true sun, expressed in time units, plus 12 hours. </dd>

References

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