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Greenwich Hour Angle The "longitude" of the geographical position (GP) of a celestial body, given in the Nautical Almanac as a positive angle between 0° and 360°. It is the Almanac's way of telling how far a GP is west of Greenwich. If GHA = 30°, the longitude of this GP is 30° West. If GHA = 270°, the longitude of the GP is 90° East. The GHAs of celestial bodies move westward at about 15° of longitude each hour. Abbreviation:  GHA

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