American Ephemeris And Nautical Almanac
The American Ephemeris And Nautical Almanac is an annual publication of the U.S. Naval Observatory, containing
elaborate tables of the predicted positions of various celestial
bodies and other data of use to astronomers and navigators.
Beginning with the editions for 1960, The American Ephemeris and Nautical Almanac issued by the Nautical Almanac Office, United States Naval Observatory, and the Astronomical Ephemeris issued by H.M. Nautical Almanac Office, Royal Greenwich Observatory, were unified. With the exception of a few introductory pages, the two publications are identical; they are printed separately in the two countries, from reproducible material prepared partly in the United States of America and partly in the United Kingdom.
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use