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[clarification needed] is directly overhead. The positions of 57 selected stars are specified relative to the First Point of Aries.
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In Great Britain, The Nautical Almanac has been published annually by HM Nautical Almanac Office, ever since the first edition was published in 1767.[1][2]In the United States, a nautical almanac has been published annually by the US Naval Observatory since 1852.[2] It was originally titled American Ephemeris and Nautical Almanac. Since 1958, the USNO and HMNAO have jointly published a unified nautical almanac, The Astronomical Almanac for use by the navies of both countries.[2] Almanac data is now available online from the US Naval Observatory.[3][4]
Celestial navigation can be very intimidating subject. It is indeed a complex topic but only if you want to understand every detail of it. Luckily enough, it is fairly easy if you just want to use it. You will have to master the use of sextant and perform simple calculations with the help of nautical almanac and sight reductions tables. 2ff7e9595c
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