J. W. Luce

Peer Reviewed

Abstract: A new lunar method of determining approximate longitude (and coincidentally latitude) without time is presented, explained and illustrated with an example. The method has been specifically designed for emergency use by the practicing marine celestial navigator who normally uses a chronometer and radio time checks but unexpectedly has neither. The method is simple and does not require measuring the arc between two bodies; simultaneous sights; special tables; prior planning; lengthy or difficult computations; or unusual plotting. It utilizes conventional sextant altitude observations, sight reduction and plotting, and a minimum of additional computation. Accuracy of the method is discussed.
Published in: NAVIGATION: Journal of the Institute of Navigation, Volume 24, Number 2
Pages: 112 - 115
Cite this article: Luce, J. W., "LONGITUDE WITHOUT TIME", NAVIGATION: Journal of The Institute of Navigation, Vol. 24, No. 2, Summer 1977, pp. 112-115.
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