Abstract
THIS issue marks an epoch in the history of the “Nautical Almanac”; it is the first drastic revision of its general arrangement since 1834. All elements that were formerly given for Greenwich mean noon are now given for mean midnight; also, all the data referring to the sun are grouped together, and the same is done for the moon. The rectangular co-ordinates of the sun are given for midnight only, but first and second differences are printed, also auxiliary interpolation tables. The co-ordinates are given both for the equinox of 1950-0 and for that of 1931-0. It is desired to encourage the use of the 1950 equinox, and tables are given for reducing observed positions to this equinox.
The Nautical Almanac and Astronomical Ephemeris for the Year 1931 for the Meridian of the Royal Observatory at Greenwich.
Standard edition. Pp. vii + 865. (London: H.M. Stationery office, 1929.) Paper, 5s. net; cloth, 7s. net.
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The Nautical Almanac and Astronomical Ephemeris for the Year 1931 for the Meridian of the Royal Observatory at Greenwich . Nature 124, 835–836 (1929). https://doi.org/10.1038/124835b0
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DOI: https://doi.org/10.1038/124835b0
