A View of Sir Isaac Newton's Philosophy

A View of Sir Isaac Newton's Philosophy

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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. 1728 edition. Excerpt: ...of all the progressrve motion of the earth 3 and-likewise that the. sun attracts both the earth and moon equal ly, when they are at the same distance from it, or that the mean action of the sun upon the moon is equal to its action 3 Ncwtonb Princ. philos. Lib. Ill. prop. 22., 23. C C upon r L upon the earth: we must therefore consider the earth as cartying about with it the moon's orbit; so that when the earth is removed from A to I, the moon's orbit 'shall likewise be removed from its former situation into that denoted by KLMN. But now the earth being in I, is the moon were found in O, so that OI should be parallel to HA, though the moon would really have moved from H to O, yet it would not have appeared to a spectator upon the earth to have moved at all, because the earth has moved as much it sels; so that the moon would still appear in the same place with respect to the sixed stars. But is the moon be observed in P, it will then appear to have moved, its apparent motion being measured by the angle under OIP. And is the angle under PIS be less than the angle under HAS, the moon will have approached nearer to its conjunction with the sun. I I. T o come now to the explication os the mentioned inequality in the moons motion: let S (in fig. 96.) represent the sun, A the earth, B C D E the moon's orbit, C the place of the moon, when in the latter quarter. Here it will be nearly at the lame distance from the sun, as the earth is. In this case therefore they will both be equally attracted, the earth in the direction A S, and the moon in the direction C S. Whence as 'the earth in moving round the sun is continually descending toward it, so the moon in this situation must in any equal portion of time descend as much; and therefore the position...show more

Product details

  • Paperback | 100 pages
  • 189 x 246 x 5mm | 195g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236950887
  • 9781236950888