The Explanatory Supplement to the Astronomical Almanac
Although not a true publication of HM Nautical Almanac Office, it does contain significant contributions made by staff of this office both past and present. This book provides an explanation of the astronomical principles and methods of computation used in The Astronomical Almanac. It describes the relevant terminology, notation and concepts of computational astronomy and provides rigorous definitions and formulae.
The revised third edition was published in Autumn 2012. Chapters were written by both former and current members of the United States Naval Observatory and HM Nautical Almanac Office as well as members of organisations such as the U.S. Geological Survey, the Jet Propulsion Laboratory, Lohrmann Observatory, the Observatoire de Paris and the University of London. The book has been edited by Sean Urban, Chief of the U.S. Nautical Almanac Office, and Dr. P. Kenneth Seidelmann, formerly of the United States Naval Observatory.
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