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.

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  • Corporate Authors:

    Institute of Navigation

    815 14th Street, NW
    Washington, DC  United States  20005
  • Authors:
    • Luce, J W
  • Publication Date: 1977-6

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Filing Info

  • Accession Number: 00165469
  • Record Type: Publication
  • Source Agency: Navigation
  • Files: TRIS
  • Created Date: Nov 23 1977 12:00AM