A Collection of Tables and Formulae Useful in Geodesy and Practical Astronomy, Including Elements for the Projection of Maps

A Collection of Tables and Formulae Useful in Geodesy and Practical Astronomy, Including Elements for the Projection of Maps

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1849 edition. Excerpt: ...Gregorian year. It cannot be immediately obtained from observation, but is always deduced from apparent time by the aid of the equation of time, which is the angular distance, in time, between the mean and true sun; or mean solar time = apparent solar time 5; equation of time. Sidereal Time is the portion of a sidereal day which has elapsed since the transit of the first point of Aries. Its point of origin cannot be determined by observation, but it is known at any moment by the right ascension of whatever object may be then in the meridian, or Sidereal time of a star's culmination = AR of Sidereal time at mean noon = AR mean @ at mean noon; and, generally, Sidereal time = sidereal time at mean noon:1; solar time from mean noon (expressed in sidereal intervals.) Solar time = sidereal time--sidereal time at mean noon, (the difference being reduced to a solar interval.) Ea: ample--To find the mean solar time of the passage of Altair over the meridian of Washington, on the 10th July, 1849. h AR: Altair, July 10th, 1849 19 27 39 Sidereal time at mean noon at Washington. = 7 14 00.96 /------Sidereal interval past Washington mean noon. = 12 29 26.43 Retardation of mean on sidereal time Corresponding mean time interval past mean noon, = 12 27 23.66 The nautical almanacs give the sidereal time at mean noon for each day of the year for a certain meridian. or mean time of culmination. If the sidereal day be taken equal to 24 sidereal hours, the mean solar day will be equal to 24" 03'" 56'.55 of those sidereal hours; or the daily acceleration of sidereal on mean solar time (which is the mean motion of the earth in a mean solar day, ) is 3"' 56'.5554 of sidereal time; hence the sidereal time at mean noon under...show more

Product details

  • Paperback | 32 pages
  • 189 x 246 x 2mm | 77g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236784405
  • 9781236784407