The American Ephemeris and Nautical AlmanacU.S. Government Printing Office, 1915 |
Contents
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Popular passages
Page 706 - ... the last half of the preceding astronomical day, and the last half of the civil day coincides with the first half of the astronomical day of the same date.
Page 710 - XII contain The Moon's Right Ascension and Declination, for each day and hour of Greenwich mean time. They are accompanied with columns of differences for one minute, which are also given at each hour. The Greenwich mean time, which is required for taking out these quantities, may...
Page 706 - The civil day begins at midnight and comprises 24 hours, the hours being counted from 0 to 12 in two series, the first marked am running from midnight to noon and the second marked pm runuing from noon to midnight. The astronomical day begins at noon on the civil day of the same date, the 24 hour
Page 710 - Jan. 0 give the corrections to be applied to the co-ordinates for noon in order to obtain the corresponding co-ordinates referred to the mean equator and the mean equinox of January 0.
Page 711 - Passage shows the hour, minute and tenth of that passage of the planet over the meridian of Greenwich which occurs next after the noon of the date. The right ascension and declination of a planet are required whenever it is observed for time, latitude or azimuth. The mode of reducing the ephemeris positions of planets to other instants of Greenwich mean time is the same as that given for the Sun on pages 554 — 555.
Page 707 - The Sun's Semidiameter and the Sidereal Time of Semidiameter Passing Meridian are also given on page I. The sun's Semidiameter is used in reducing the altitude of the upper or lower limb of the sun to the altitude of the center; and in reducing the angular distance of the limb from the moon or some other object, to the distance from the center of the sun. The sidereal time of semidiameter passing the meridian is employed in obtaining the passage of the sun's center over the wires of a transit-instrument,...
Page i - That the work of the Nautical Almanac Office during the continuance of any such arrangement shall be conducted so that in case of emergency the entire portion of the work intended for the use of navigators may be computed by the force employed by that office, and without any foreign cooperation whatsoever : Provided further, That any employee of the Nautical Almanac Office who may be authorized in any annual appropriation bill and whose services in whole or in part can be spared from the duty of...
Page i - Navy is hereby authorized to arrange for the exchange of data with such foreign almanac offices as he may from time to time deem desirable, with a view to reducing the amount of duplication of work in preparing the different national nautical and astronomical almanacs and increasing the total data which may be of use to navigators and astronomers available for publication in the American Ephemeris and Nautical Almanac...
Page 710 - Jupiter, and Saturn, it is mean noon of the second day following ; and in the case of Uranus and Neptune, mean noon of the fourth day following. Pages...
Page xiv - Conjunction, or having the same Longitude or Right Ascension. D Quadrature or differing 90° in...