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Local Hour Angle Used in a sight reduction, it is the number of longitude degrees that the geographical position of a body is west of the assumed longitude (a-Lon). It is figured from the Greenwich hour angle (GHA) as: LHA = GHA - a-Lon(West) or LHA = GHA + a-Lon(East). The GHA is listed in the Nautical Almanac. Although the rules for figuring it are different in east and west longitudes, the meaning of the result is the same. When using sight reduction tables, a-Lon is always chosen such that LHA will be a whole number of degrees with no minutes part. At meridian passage, LHA equals 0°. See Greenwich hour angle and Assumed Longitude. Abbreviation:  LHA

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