The Observatory Volume 2

The Observatory Volume 2

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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. 1879 edition. Excerpt: ...followed by both the Struves, as is very clearly seen by referring to the curves which M. Struve has laid down representing the absolute corrections to distances as observed by several astronomers. One of the most interesting of thesa curves is that representing the absolute corrections to distances of double stars as measured by Bessel with the Konigsberg heliometer. Those readers of the ' Observatory ' who are familiar with the history of Astronomy will remember that, about the year 1831, Bessel and W. Struve undertook in concert the observations of distances of double stars, the one with the Konigsberg heliometer, the other with the Dorpat refractor, and that a comparison of the observations showed considerable differences in the measures. Some of these may be represented by the following table: --Dist. 2-89 2= B--0-199 5-60--0-265 12-00--oT69 By applying, however, to 2 the absolute corrections as determined by M. Otto Struve for the same distances, we obtain for distances measured by Bessel the absolute corrections: --Dist. 2-89-0-055 5-60--0-042 12-00 +0-017 It follows that, beginning from about 5" distance, the greater distances have been measured by Bessel with almost absolute exactness. With regard to the negative corrections to the smaller distances, M. Struve believes them to be real, notwithstanding the indirect method by which they have been obtained; but he admits that the numerical values are subject to probable errors of considerable magnitude. M. Struve also compares his measures of double stars with those of Dawes, Dembowski, Secchi, and DuneV. The following rimmi. gives the general result of the comparisons. Constant errors in the measurement of position-angles do not appear to exist in the observations of more

Product details

  • Paperback | 188 pages
  • 189 x 246 x 10mm | 345g
  • United States
  • English
  • black & white illustrations
  • 123691094X
  • 9781236910943