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单词 Air Almanac
释义 Air Almanac
[`er `ȯl·mǝ´nak]
NAVIGATION
1. A periodical publication of astronomical data useful to and designed primarily for air navigation.
2. 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.
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