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词汇 Nautical almanac
分类 英语词汇 英语翻译词典
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Nautical almanac

英语百科

Nautical almanac

Two sample pages of the 2002 Nautical Almanac published by the U.S. Naval Observatory

A nautical almanac is a publication describing the positions of a selection of celestial bodies for the purpose of enabling navigators to use celestial navigation to determine the position of their ship while at sea. The Almanac specifies for each whole hour of the year the position on the Earth's surface (in declination and Greenwich hour angle) at which the sun, moon, planets and first point of Aries is directly overhead. The positions of 57 selected stars are specified relative to the first point of Aries.

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