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Home > History and Archaeology > History > Letters on Astronomy; In Which the Elements of the Science Are Familialry[!] Explained in Connection with Biographical Sketches of the Most Eminent Astronomers
Letters on Astronomy; In Which the Elements of the Science Are Familialry[!] Explained in Connection with Biographical Sketches of the Most Eminent Astronomers

Letters on Astronomy; In Which the Elements of the Science Are Familialry[!] Explained in Connection with Biographical Sketches of the Most Eminent Astronomers


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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. 1858. Excerpt: ... nng in about ten and a half hours. This is known by observing the rotation of certain dusky spots, which sometimes appear on its surface. This motion is nearly the same with the diurnal motion of Jupiter, subjecting places on the equator of the planet to a very swift revolution, and occasioning a high degree of compression at the poles, the equatorial being to the polar diameter in the high ratio of eleven to ten. Saturn's ring, in its revolution around the sun, always remains parallel to itself. If we hold opposite to the eye a circular ring or disk, like a piece of coin, it will appear as a complete circle only when it is at right angles to the axis of vision. When it is oblique to that axis, it will be projected into an ellipse more and more flattened, as its obliquity is increased, until, when its plane coincides with the axis of vision, it is projected into a straight line. Please to take some circle, as a flat plate, (whose rim may well represent the ring of Saturn, ) and hold it in these different positions before the eye. Now, place on the table a lamp to represent the sun, and holding the ring at a certain distance, inclined a little towards the lamp, carry it round the lamp, always keeping it parallel to itself. During its revolution, it will twice present its edge to the lamp..at opposite points; and twice, at places ninety degrees distant from those points, it will present its broadest, face towards the lamp. At intermediate points, it will exhibit an ellipse more or less open, according as it is nearer one or the other of the preceding positions. It will be seen, also, that in one half of the revolution, the lamp shines on one side of the ring, and in the other half of the revolution, on the other side. Such would be the successive appearances...


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Product Details
  • ISBN-13: 9781150566233
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 130
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 115056623X
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 245 gr

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Letters on Astronomy; In Which the Elements of the Science Are Familialry[!] Explained in Connection with Biographical Sketches of the Most Eminent Astronomers
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