Samuel Herrick

Peer Reviewed

Abstract: The requirements of high-speed navigation have again focused at attention upon the pre-computation of celestial lines of position. I shall accordingly attempt here to describe a short method originally worked out in 1943, but given only informal circulation at that time. Its features are that it dispenses with the cumbersome plotting of a curve of altitudes in a graph, and allows the use of H.0.218 or H.O.249(instead of H.0.211) for the determination of star altitudes without interpolation. For sun lines also tabular altitudes are used and the interpolation for declination is plotted along with other corrections, and not applied numerically.
Published in: NAVIGATION: Journal of the Institute of Navigation, Volume 2, Number 9
Pages: 321 - 324
Cite this article: Herrick, Samuel, "A SHORT METHOD FOR PRECOMPUTATION", NAVIGATION: Journal of The Institute of Navigation, Vol. 2, No. 9, 1951, pp. 321-324.
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