The Air Almanac 2021
US Naval Observatory Washington United States
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The object of The Air Almanac is to provide in a convenient form the astronomical data required for air navigation. This volume contains ephemeral data for the year, together with auxiliary tables and graphs, and a brief Explanation of the use of the volume. The daily pages contain data for the Sun, Aries, planets and Moon. The data for the 57 stars in the standard list are given on both the inside front cover and on the flap for convenience in use with the daily pages. The remaining tables, diagrams and explanatory material are arranged, as far as possible, in order of importance backwards from the end of the volume. The list of contents is given on the inside back cover.
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