Publications of the Astronomical Laboratory at Groningen Volume 1-3; No. 5

Publications of the Astronomical Laboratory at Groningen Volume 1-3; No. 5

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 edition. Excerpt: ...If therefore we put the total number of stars, which the catalogue will contain at 0 1 500000 we get for the double set of plates 2x1 500 000 x 12 = 36 000 000 readings. As the pointings are certainly not more troublesome in the case of the parallax plates, we come to the conclusion that the labour of measuring for the complete double set of parallax plates will be quite of the same order as the labour of measuring for the catalogue of the carte du ciel. It is true that for the parallaxes a supplementary series of plates is to be considered. On these plates however it will be only necessary to measure the principal objects, suspected of sensible parallax, together with (say) half a dozen of stars of comparison. The supplementary measures will thus represent only a very small fraction of the whole labour. c. The reductions. Much more defficult it is to compare the work of reduction with that necessary ior the plates of the carte du ciel. After careful consideration I have come to the conclusion that the work to be expended on the reduction of the parallaxes will be quite comparable, if not even considerably smaller, than would be the labour to derive for the carte du ciel plates, (a) the orientation, (b) the scale value. (c) the coordinates of the centre of each plate, together with the reduction of the measures to rectangular coordinates and the application to these of the corrections for (a) and (b). The total labour required for the parallaxes will unquestionably be incomparably smaller than that for the carte du ciel catalogue, if in the latter we include the reduction to right-ascension and declination. The considerations on which this conclusion mainly rest are: first, that all the measures made for parallax of 12 images of each star are...show more

Product details

  • Paperback | 42 pages
  • 189 x 246 x 2mm | 95g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236561732
  • 9781236561732