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About: The original "Explanatory Supplement to the Astronomical Ephemeris and the American Ephemeris and Nautical Almanac" was published in 1961 and revised in 1974.
About: The Explanatory Supplement provides a detailed description of how to perform practical astronomy or spherical astronomy.
Textbook on Spherical Astronomy | The Astronomical Almanac for the Year 2011 | Astronomical Algorithms | Astronomy on the Personal Computer
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