The American Ephemeris and Nautical Almanac

…was especially attracted to the American Ephemeris and Nautical Almanac, an annual handbook for astronomers, containing predicted positions in the sky of the principal celestial objects and other astronomical phenomena. He thereupon applied for employment in the American Nautical Almanac Office, then at Cambridge, Mass., and became a computer there…

The American Ephemeris and Nautical Almanac was first published in Washington, D.C., in 1852 for the year 1855. From 1877, under the direction of the astronomer Simon Newcomb, it became the best of the national ephemerides. To avoid duplication of costs, it has since 1960…