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altitude

The Oxford Companion to Ships and the Sea | 2006 | © The Oxford Companion to Ships and the Sea 2006, originally published by Oxford University Press 2006. (Hide copyright information) Copyright

altitude, from the Latin altitudo, height, the angular distance of a celestial body above the horizon. The angle required in celestial navigation is that between the centre of the earth and the centre of the body observed. Corrections thus have to be made to the sextant altitude (the reading shown on the instrument) to obtain the observed altitude, which is that required to work up the sight, to use the time-honoured phrase. The altitude corrections, as they are called, are given in nautical almanacs and most nautical tables. They are, for index and any other instrumental error, dip (for height of eye), refraction, and, for the sun and moon only (because of their proximity to the earth), a correction for semi-diameter. The term computed altitude as used in modern tables of computed altitude and azimuth may be defined as the theoretical altitude of a body at a particular place and time.

Mike Richey

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"altitude." The Oxford Companion to Ships and the Sea. Oxford University Press. 2006. Encyclopedia.com. 29 Nov. 2009 <http://www.encyclopedia.com>.

"altitude." The Oxford Companion to Ships and the Sea. Oxford University Press. 2006. Encyclopedia.com. (November 29, 2009). http://www.encyclopedia.com/doc/1O225-altitude.html

"altitude." The Oxford Companion to Ships and the Sea. Oxford University Press. 2006. Retrieved November 29, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O225-altitude.html

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