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Astronomy Volume 2; Explained Upon Sir Isaac Newton's Principles

Astronomy Volume 2; Explained Upon Sir Isaac Newton's Principles


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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. 1821 Excerpt: ...of 27 days 7 hours and 37 minutes it again vanishes behind the same limb; but, during this interval of time, the Earth has advanced in its orbit, and in the same direction with the spot; and therefore, 'when the spot reaches the Sun's western limb, after one complete revolution the western limb of the Sun, behind which it vanishes, has shifted in absolute space to the westward, so that the spot has performed a complete revolution, and part of a revolution round the centre of the Sun. We have therefore 365d 5h 48' + 27d 7h 37', or 392d 13h 25 is to 365d 5h 48" as 27d 7h 37', the apparent revolution of the spots is to 25d 9h 56', the real revolution of the spot, or the time in which the Sun performs his rotation about its axis. The axis of the Sun, round which this revolution is performed, is inclined 7 20' to the ecliptic, and the node of the solar equator is in the 18th degree of Gemini The solar spots are never seen towards the poles of that luminary. They are generally confined within a zone, stretching about 30 5' on both sides of his equator, though sometimes they have been seen in the latitude of 39 5' M. Silberschlag of Magdeburgh made several observations on the solar spots in the year 1768, from which he draws the strange conclusions that they have a motion of rotation, and that they change their place on the surface of the Sun, independent of his monthly revolution. He also concluded that the spots had not merely the dimensions of length and breadth, but that they consisted of thick masses of opaque matter. (Bernoulli's Lett. Astron. p. 6.) Galileo, Hevelius, Selenographia, p. 83), and Tlleory of Maupertuis, CEuvres, vol. i, p. 64, ) seem to have the solar considered the spots as scoria floating in the in-spotbflammable liquid matter, of which ...


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Product Details
  • ISBN-13: 9781236105523
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 102
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1236105524
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 195 gr


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