Modern Astronomy; From the North American Review for April, 1825

Modern Astronomy; From the North American Review for April, 1825

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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. 1825 edition. Excerpt: ... observations of the moon, makes the sun's parallax 8."56, being nearly the same as was found by Encke S'.5776, by his elaborate investigation of all the observations of the transits of Venus of 1761 and 1769, published in his treatises, Die Entfernung der Sonne von den Erde aus dem Penus-durchgange, &tc. This method of finding the sun's distance from the earth by the lunar theory, is susceptible of considerable accuracy, on account of the great number of observations which can be used, so that it may even be preferred to any other. known method. It must however be considered, as a very singular circumstance, that the sun's distance from the earth can be best determined by observing the moon's longitude, and that the same observation will also fix, with the greatest accuracy, the number of miles the earth is compressed at the poles. It shows in a striking manner the powers of modern analysis, when combined with the Newtonian theory of gravity. Attempts are still making to deduce the whole of the lunar equations from that theory alone. Laplace has done much for the attainment of this object, also Carlini and Plana have developed the analytical expression of these equations to a much greater degree of accuracy, than had ever before been done, f and it is to be hoped that it will not be long, before this important point will be attained. For after all, there is much uncertainty in referring wholly to observations, and the fact, that Laplace has found it necessary to change the form of the small equations of the moon's mean motion discovered by Burg, altering its period from 184 to 179 years, shows that this is not a satisfactory method of ascertaining equations of a long period of time. Matthew Stewart also attempted to calculate the sun's...
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Product details

  • Paperback | 24 pages
  • 189 x 246 x 1mm | 64g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236504364
  • 9781236504364