Encyclopedia

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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References in periodicals archive
the time between the end of evening civil twilight and the beginning of morning civil twilight, as published in the Air Almanac, converted to local time."
Night OPS
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.
Dick, Steven J. Sky and Ocean Joined: the U.S. Naval Observatory, 1830-2000
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.
Dutton's Nautical Navigation
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