Abstract
250 years ago, in 1766, the first edition of The Nautical Almanac and Astronomical Ephemeris was prepared, detailing astronavigational and general astronomical data for the year 1767. Today, fulfilling the same purpose, The Nautical Almanac, serving the mariner’s celestial navigation needs, and The Astronomical Almanac, a worldwide resource for fundamental astronomical data, are still published annually. Since 1981, both books have been jointly published by HM Nautical Almanac Office in the UK and the Nautical Almanac Office of the US Naval Observatory.
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