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Explanatory Supplement to the Astronomical Almanac

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If you need to know the details of astronomical or geodetic computations, or need to know how the tables in the Astronomical Almanac are computed, or need to know what the various versions of "Universal Time" are and how to compute them, you need this book. It is the definitive reference for many things, and gives you the definitive reference for the rest.

The 1992 Explanatory Supplement has, unfortunately, many errors and typos. Be very careful using any data from it. Look up the published errata online, and if you can, look up the original sources also, as all of the errors are not in the errata!
Other than that, it is the definitive source, and the references alone are a goldmine of information. If you are really deep into astronomical ephemerides, you should get a copy of the 1961 Supplement also. It goes deeper into the trig math, and doesn't use a lot of vector math like the 1992 version.