American Ephemeris and Nautical Almanac

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American Ephemeris and Nautical Almanac is a publication that contained information necessary for navigation, as well as data for use by surveyors and astronomers, such as a lunar ephemeris. Based on the original British publication, The Nautical Almanac and Astronomical Ephemeris, the authorization to publish this work was approved in 1849, resulting in the founding of the U.S. Nautical Almanac Office.

The American Ephemeris and Nautical Almanac first appeared in print in 1852, giving data for the year 1855. The information was originally determined through the use of human "computers", such as Chauncey Wright and Joseph Winlock. In 1916, following the example of the U.K., the U.S. published the marine navigation information separately as the U.S. Nautical Almanac. The work was unified in 1958.