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'''Greenwich Hour Angle'''
 
</dt><BR/>Angular distance west of the Greenwich [[Celestial Meridian|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|celestial 
sphere]], measured westward from the Greenwich celestial meridian through 
360 degrees; local hour angle at the Greenwich meridian. 
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==References==
''This article is based on NASA's [[NASA SP-7|Dictionary of Technical Terms for Aerospace Use]]''
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