A Mathematical and Philosophical Dictionary; Containing an Explanation of the Terms, and an Account of the Several Subjects, Comprized Under the Heads Mathematics, Astronomy, and Philosophy Both Natural and Experimental Volume 2

A Mathematical and Philosophical Dictionary; Containing an Explanation of the Terms, and an Account of the Several Subjects, Comprized Under the Heads Mathematics, Astronomy, and Philosophy Both Natural and Experimental Volume 2

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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. 1795 edition. Excerpt: ...or nearly so; for the several Retrogradations of the fame planet are not constantly equal. These various circumstances however in the motions of the planets are not real, but only apparent; as the inequalities arise from the motion and position of the earth, from whence they are viewed; for when they are considered as seen from the fun, their motions appear always uniform and regular. These inequalities are thus explained: Let S denote the fun; and ABCD &c the path or orbit of the earth, moving from west to east, and in that order; also GK ice the orbit of a superior planet, as Saturn for instance, moving the fame way, or in the direction GKLG, but with a much less celerity than the earth's motion. Now when the earth is at the point A of its orbit, let Saturn be at G, in conjunction with the fun, when it will be seen at P in the zodiac, or among the ftars. and when the earth has moved from-A to E, let Saturn have moved from G to H in its orbit, when it will be seen in the line BHQ, and will appear to have moved from P to Q__in the zodiac; also when the earth has got to C, let Saturn be arrived at I, but found at R in the zodiac, where being seen in the line CIR, it appears stationary, or without motion in the zodiac at R. But after this, Saturn will appear for some time in Retrogradation, viz, moving backwards, or the contrary way: for when the earth has moved to D, Saturn will have got to K, and, being seen in the line DKQ, will appear to have moved retrograde in the zodiac from R to Qj about which place the planet, ceasing to recede any farther, again becomes stationary, and afterward proceeds forward again.; for while the earth moves from D to E, and Saturn from K to L, this latter, being now seen in the line ELR, appears to Vol. II. have...show more

Product details

  • Paperback | 672 pages
  • 189 x 246 x 34mm | 1,179g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123654286X
  • 9781236542861