Nautical Almanac For The Year 2021 - Keeping "The Fleet Safely Afloat"

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From the joint effort of the United States Nautical Almanac Office with Her Majesty's Nautical Almanac Office: "Nautical Almanac For The Year 2021" to guide sailors safely, military, and civilians.

Nautical Almanac For The Year 2021

The Almanac contains data tabulated at hourly intervals to a precision of 0.1 arc minute: the Greenwich hour angle and declination of the Sun, Moon, and navigational planets; the Greenwich hour angle of Aries; positions of the navigational stars; rise and set times of the Sun and Moon for a range of latitudes; and other data.

Each edition also contains a sight reduction table; sight reduction formulas; and various correction tables for sight reduction. There is a useful concise sight reduction form at the back of the book. The Nautical Almanac is available several months in advance of its edition date.

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