Lunar method

the method of finding a ship's longitude by comparing the local time of taking (by means of a sextant or circle) a given lunar distance, with the Greenwich time corresponding to the same distance as ascertained from a nautical almanac, the difference of these times being the longitude.

See also: Lunar

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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The lunar method measures the rotation of the moon around the earth, 354 days for 12 revolutions.
Almost a century later the longitude problem was finally solved through both the lunar method and the invention of the marine chronometer by Yorkshire clockmaker John Harrison.
The 43-year-old started using the lunar method earlier this year and said it was too early to say whether it had made significant improvements to his crops.