You can borrow or stream a complete 1992 edition (reprinted 2006) for free.

The Explanatory Supplement to the Astronomical Almanac is the definitive reference work for understanding the methods, theories, and algorithms used to generate the data in The Astronomical Almanac . For astronomers, navigators, geodesists, and developers of astronomical software, this text is indispensable.

The official companion websites hosted by USNO and HMNAO provide freely downloadable PDF supplements, errata, and updated software routines (such as the Standards of Fundamental Astronomy, or SOFA, libraries) that implement the book's equations.

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