Title: THE AMERICAN NAUTICAL ALMANAC AND ITS IMPROVEMENT
Author(s): Paul E. Wylie
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 1, Number 7&8
Pages: 174 - 177
Cite this article: Wylie, Paul E., "THE AMERICAN NAUTICAL ALMANAC AND ITS IMPROVEMENT", NAVIGATION, Journal of The Institute of Navigation, Vol. 1, No. 7&8, 1947, pp. 174-177.
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Abstract: The most important use of nautical almanacs is the determination of the Greenwich Hour Angle (GHX) and the declination of astronomical bodies at a given moment of Greenwich Civil Time (GCT). Since the declination of all bodies changes slowly, existing interpolation tables for declination are simple and accurate, and no reason exists for discussion of current methods. For the Greenwich Hour Angle, however, rapid change in value with time has led to a variety of methods, of varying accuracy and simplicity.