air almanac

Air Almanac

[′er ′ȯl·mə‚nak]
(navigation)
A periodical publication of astronomical data useful to and designed primarily for air navigation.
A joint publication of the U.S. Naval Observatory and the Royal Greenwich Observatory, listing the Greenwich hour angle and declination of various celestial bodies at 10-minute intervals, the time of sunrise, sunset, moonrise, and moonset, and other astronomical information arranged in a form convenient for navigators; each publication covers 4 months.

air almanac

A joint publication of the National Almanac Office and the U.S. Naval Observatory and Her Majesty's Nautical Almanac Office (UK). It covers a four-month period and contains tabulated values of the Greenwich hour angles and the declination of the selected celestial bodies, along with additional celestial data used in navigation.
References in periodicals archive ?
In terms of practical contributions to fleet operations, the observatory played a key role in providing the most up-to-date navigational technology to ships at sea, even mass-producing chronometers during both world wars, and providing early applications of punch-card calculating technology for the production of an improved and more accurate American Air Almanac from 1941.
An exhaustive chapter on ephemeral data follows, which features charts on Nautical and Air Almanac tabulations and calculations and interpolations--actually, so much could be written about this dictionary/encyclopaedia/working reference manual that brevity of summation is virtually impossible.
When he reviewed the air almanac, he discovered that although the months were correct, he had the wrong year (1972 versus 1973)

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