Astronomical Almanac
The Astronomical Almanac are an official Astronomical Yearbook of the International Astronomy ( International Astronomical Union, IAU ) and the Earth Sciences ( International Union of Geodesy and Geophysics, IUGG ). They are issued in the U.S. ( United States Naval Observatory ) and in London ( Her Majesty's Stationery Office ) and, together with the ephemeris of the star catalog FK6 (see APFS, Apparent Places of Fundamental Stars ) the spatially fixed reference system of the heavens and earth sciences.
Content
As the yearbook APFS ( Apparent Places of Fundamental Stars ) also include the Astronomical Almanac about 500 pages. As detailed Supplement is this about every 10 years, the " Explanatory Supplement " published in which all theoretical questions of the reference system are discussed, as well as the data, formulas and astronomical calculation underlying models.
The key ingredient of the Astronomical Almanac - which is the internationally edited successor of the Berlin Astronomical Yearbook since the 1960s - are ( = ephemeris "on the day expected " ) accurate forecasts of all major bodies in the solar system, in particular
- The sun ( sun's path as a mirror image of the Earth's orbit ), solar rotation ( helio graphic coordinates) and position angle their North Pole
- The moon ( moon phases and lunar orbit ), selenografische coordinates short-period nutation,