Popular Astronomy Volume 1

Popular Astronomy Volume 1

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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. 1894 edition. Excerpt: ...night, thus throwing out the effect of the Earth's daily motion. This apparent motion is due to the Earth's revolution round the Sun. The fixed stars have the same apparent movement, except that Jupiter's real motion retards a little the apparent movement due to the Earth's revolution. All these movements to and from the horizon are to be disregarded. The planet's real or proper motion, which is the chief object of attentfon is indicated by its change of place among the fixed stars. Whenever it crosses a line joining two other stars on the same or opposite sides of it, its motion becomes evident at once by the making or breaking of the line. It often forms with other stars, regular figures, triangles, diamonds, etc, and any variation in the regularity of the figure makes the movement quickly evident. (III.) But the inexperienced observer will be surprised to find that Jupiter is now moving apparently west, not east. This is apparent, and lasts for sixty days before and sixty days after opposition, when the planet seems to become stationary for about two weeks, after which we can plainly see that it is moving eastward. This is an apparent movement precisely similar to that which takes place when a faster walker overtakes and passes a slower walker bound in the same direction as himself. It takes place near opposition only, because only then, the Earth and planet move towards the same quarter of the heavens. Their direction of revolution is always the same. E. A. b. Errata in December number--Page 165, line 15 from top, for /S Cassiopeiae, read B Cassiopeiae. Page 167, line 10 from bottom, for Nov. 1, read Nov. 16. 1 No. 7. No. 8. No. 9. Photographic History Of The 40-inch Crown Disc Of Yerkes Telescope. From photographs furnished b M. Mantois of...show more

Product details

  • Paperback | 184 pages
  • 189 x 246 x 10mm | 340g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236653939
  • 9781236653932