On page vii, the listed major contributors to its various Sections are: H.M Nautical Almanac Office, United Kingdom Hydrographic Office; the Nautical Almanac Office, United States Naval Observatory; the Jet Propulsion Laboratory, California Institute of Technology; the IAU Standards Of Fundamental Astronomy (SOFA) initiative; the Institut de Mécanique Céleste et des Calcul des Éphémerides, Paris Observatory; and the Minor Planet Center, Cambridge, Massachusetts.
The almanac largely contains Solar System ephemerides based on the JPL Solar System integration "DE440" (created June 2020), and catalogs of selected stellar and extragalactic objects.
In addition to ancillary information, the Astronomical Almanac Online extended the printed version by providing data best presented in machine-readable form.
In 1981 the British and American publications were combined under the title The Astronomical Almanac.
[4] It covers its history, significance, sources, methods of computation, and use of the data.