provides the data (ephemerides) for a specific year, the Supplement explains the mathematical models
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Updated for modern reference systems and published by University Science Books. as it can be easily searched
The Explanatory Supplement to the Astronomical Almanac is available for download in PDF format. The PDF version is a convenient way to access the supplement, as it can be easily searched, zoomed, and printed. provides the data (ephemerides) for a specific year,