Publications of the Astronomical Laboratory at Groningen Volume 13-19

Publications of the Astronomical Laboratory at Groningen Volume 13-19

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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. 1904 edition. Excerpt: ...given by Bessel himself for /it and kK. Those given by Schur are much smaller. We have thus CJ4 Residuals. 1750-0 i8o-4 +o'5 1836 0 238-3--0-7 190c 1 283 l + O "I. The value of-y derived from these is: at, 4 = 0-OOl882 O 00003O, at leaving the residuals indicated above. The quantity added with the sign rp has the same meaning as above. The probable error derived from the probable errors of the observed values of o4 would be considerably smaller. Mr. Cookson (Cape Annals Vol. XII, part II, page 197), found from the observations of 1891, 1901 and 1902 combined with those made by Bessel and Schur (1879): dvs = + 0-OOl892 00,0O0O24. The agreement is satisfactory. Souillart's value is + o0, ooi999. This therefore seems to require a considerable negative correction1.) 17 CHAPTER V. DISCUSSION OF RESULTS. 20. We must now compare the results derived from the observations at the 20. Compari different epochs to derive the constants of the libration. The direct results from "n. rMult81 _ Weights. the observations, which have been found in the Chapters II and III, are collected in Table XVII. Table XVII. Direct Results From Observations. The weights contained in the last column are based partly on the probable errors, partly on the following considerations. The three heliometric oppositions must have a higher weight than the others, on account of their greater freedom from systematic errors. Although according to the probable errors the opposition 1891 should have at least twice the weight of those of 1901 and 1902, I have only given it the weight 3, in order not unduly to increase its influence on the determination of the period, already preponderating by its position at the end of the series. The best of the photographic oppositions...show more

Product details

  • Paperback | 78 pages
  • 189 x 246 x 4mm | 154g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236755707
  • 9781236755704