Astronomical Observations Made at the Royal Observatory, Edinburgh Volume 1

Astronomical Observations Made at the Royal Observatory, Edinburgh Volume 1

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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. 1838 edition. Excerpt: ...between the direct and reflected Equatorial points, or twice the Colatitude was assumed 68. 5'. 14," 6. If this be diminished by any quantity, the northern Declinations by the reflected observations will be increased by the same quantity. Therefore to make the Declinations of Stars north of the Zenith found by the direct and reflected observations agree, the double Colatitude is to be diminished by 0,"10; and, of Stars south of the Zenith, by 1,"78. The mean is 0,"94 to be subtracted from the assumed double Colatitude; whence the Latitude is 55. 57'. 23,"2. IX. Positions of the Principal Stars. The following Catalogue, arranged in the order of Polar distance, contains the mean Right Ascensions and Declinations, for the beginning of 1835, of the principal Stars deduced from the observations, with the differences between them and the values given in the Nautical Almanac for 1835, second edition, and the Berlin Ephemeris for the same year. The Right Ascensions and Declinations of a and 8 Urs Minoris, are those investigated in Section VI. The Right Ascensions of the other Stars are the means of the values from the observations above and below the Pole (when the Star has been observed in these two situations), taken according to the number of observations; the Declinations are the results of the direct observations above the Pole. The signs of the differences direct, how they are to be applied to the values in the Ephemerides to produce those obtained from the observations. The Right Ascension is of the middle of the two Stars; the Declination, of the following. X. Observations of the Sun. The mean difference of the Sun's observed and tabular Right Ascensions is, XI. Observations of the Moon. The mean difference...show more

Product details

  • Paperback | 28 pages
  • 189 x 246 x 2mm | 68g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236845080
  • 9781236845085