GREENWICH HOUR ANGEL (GHA)
GHA of a body is the arc of the equinoctial,or the angel at the celestial pole,measured westerly from the celestial meridian of Greenwich to the celestial meridian passes through that body
LOCAL HOUR ANGEL (LHA)
LHA of a body is the arc of the equinoctial,or the angel at the celestial pole,measured westerly from the observer's celestial meridian to the celestial meridian.
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