Lectures on Astronomy; Delivered at King's College, London

Lectures on Astronomy; Delivered at King's College, London

By (author) 

List price: US$13.19

Currently unavailable

Add to wishlist

AbeBooks may have this title (opens in new window).

Try AbeBooks

Description

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. 1846 edition. Excerpt: ...called the radius vector, in one minute of time, is equal to half the product of the angle Ps o. by the square of the distance s P. And if this product be the same in every portion of the earth's orbit, it follows. that the area swept over by the radius vector of the earth in every minute is the same, and therefore the area swept over in 60 minutes in one part of the orbit, is the same as that swept over in 60 minutes of any other portion of the orbit, and thus that the space or area swept over by the radius vector in one hour, in one day, or one week or month, in any one portion of the earth's orbit, is the same as the area swept over in any other. Now we have shown that the product of the angle described in a day by the square of the distance is the same everywhere. And precisely the same observations will prove the same fact in reference to the angle described in a minute. It follows then, generally, that the area thus described by the earth in a given time in one portion of its orbit, is precisely the same as that described in the same time in any other portion. This is called the law of the equal description of areas. And it was in this form that it was promulgated by Kepler. We shall show, hereafter, that it results from this fact that the deflection of the earth from the rectilinear path which it would otherwise have in space, is produced by a force acting always towards the sun, and not at different periods towards different points in space, or at the same time towards different centres. It points out, therefore, with certainty the sun as the controlling power in the earth's motion, distinguishing it in this respect from all the other material existences which people space, but establishing nothing as to the law by...show more

Product details

  • Paperback | 70 pages
  • 189 x 246 x 4mm | 141g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236885899
  • 9781236885890