lunar distance
The Oxford Companion to Ships and the Sea
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2006
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© The Oxford Companion to Ships and the Sea 2006, originally published by Oxford University Press 2006. (Hide copyright information)
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lunar distance, an observation of the angle between the edge of the moon or sun, or a planet, in order to find
Greenwich Mean Time (
GMT) at sea and so determine the
longitude. The moon has a relatively rapid motion across the heavens in relation to the fixed stars, so that the angular distance between the moon and any fixed star that lies in the moon's path changes comparatively rapidly. The earlier
nautical almanacs provided the
navigator with tables of predicted lunar distances (the angles between the moon and certain fixed stars, as well as the sun) against GMT. By observing a lunar distance it was possible to ascertain, by interpolation between tabulated values of lunar distances against GMT, the precise GMT of the observation. By comparing this with the local time of the observation, the longitude of the ship could be ascertained. The introduction of the
chronometer, bringing GMT permanently on board, made lunar observations no longer necessary for the accurate determination of longitude. See also
board of longitude.
Mike Richey
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Ellen A. Aguilar; Dennis Bruce Bergersen; Pierre R. Camin . Frank Divona. Bernard Allen Glassman. Christine Sheedy Hall. Freda Elizabeth Hargett. Lillian Davis Hill. AutumnEleanor Hokom. Charles Lewis Lever. Sally C. Moreno. Robert Leland Wright
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 "Morning Call (Allentown, PA)")
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Charles James Lever
Book article from: The Columbia Encyclopedia, Sixth Edition
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Unilever Plc (Unilever N.V.)
Book article from: International Directory of Company Histories
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Unilever PLC Unilever N.V.
Book article from: International Directory of Company Histories
...operations. William Hesketh Lever, later Lord Leverhulme...1851. The founder of Lever Brothers, Lever ’ s personality...to Unilever historian Charles Wilson. During the depression...necessity item. His father, James Lever, was initially...
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Unilever
Book article from: International Directory of Company Histories
...Origins William Hesketh Lever, later Lord Leverhulme...1851. The founder of Lever Brothers, Lever had a personality that...to Unilever historian Charles Wilson. During the depression...necessity item. His father, James Lever, initially was...
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Sidney Godolphin
Encyclopedia entry from: Encyclopedia of World Biography
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