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A Treatise of Astronomy, Descriptive, Physical, and Practical Designed for Schools, Colleges, and Private Students

A Treatise of Astronomy, Descriptive, Physical, and Practical Designed for Schools, Colleges, and Private Students


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About the Book

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. 1850 Excerpt: ...Accordingly the orbits of comets must take the form of a parabola, for we thus designate the curve into which the ellipse passes, when indefinitely elongated. "If we introduce this modification into the laws of Kepler, which The parallaxes of comets are known to be small, by two observers, at distant stations on the earth, comparing their observations taken on the same comet at near the same time. At the times the observations are made, neither observer can know how great the parallax is. It is only afterward, when comparisons are made, that judgment, in this particular, can be formed j and it is not common that any more definite conclusion can be drawn, than that the parallax is small, and, of course, the body distant. Chap. XII. Comets describe equal areas in equal times. Three observations sufficient to find the orbit of a comet. relate to the elliptical motion, we obtain those of the parabolic motion of comets. " Hence it follows that the areas described by the same comet, in its parabolic orbit, are proportional to the times. The areas described bydifferent comets in the same time, are proportional to the square roots of their perihelion distances. " Lastly, if we suppose a planet moving in a circular orbit, whose radius is equal to the perihelion distance of a comet, the areas described by these two bodies in the Same time, Will be to each other as 1 to J%m Thus are the motions of comets and planets connected. " By means of these laws we can determine the area described by a comet in a given time after passing the perihelion, and fix its position in the parabola. It only remains then to bring this theory to th-5 test of observation. Now we have a rigorous method of verifying it by causing a parabola to pass through several obs...


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Product Details
  • ISBN-13: 9781130770063
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 100
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1130770060
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 195 gr


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