Greenwich Hour Angle

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Greenwich Hour Angle

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Angular distance west of the Greenwich celestial meridian; the arc of the celestial equator, or the angle at the celestial pole, between the upper branch of the Greenwich celestial meridian and the hour circle of a point on the celestial sphere, measured westward from the Greenwich celestial meridian through 360 degrees; local hour angle at the Greenwich meridian. </dd>

References

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