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The Elements of Descriptive Astronomy

The Elements of Descriptive Astronomy


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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. 1919 edition. Excerpt: ...longitudes if Greenwich Observatory were slowly moving away, perhaps at varying speed, across the surface of England. We have stated that the Celestial Equator and the Ecliptic are great circles of the Celestial Sphere. They cut one another at two opposite points, and they cut at an angle of 23i. Fig. 11 shows two circles cutting in such a manner. Remember what these circles are. We will suppose the upper one to be the Ecliptic--the Sun's yearly backward path. The Sun is at the point A on March 21. This point is known as the First Point of Aries, and the hour circle passing through this point is the one from which Right Ascensions are measured. Longitudes on the Earth are measured as angles. Right Ascensions are sometimes measured as angles, and are reckoned up to 360 in the reverse direction to that in which the sphere rotates, but it is more usual to reckon them in hours, minutes, and seconds, at the rate of 15 per hour. For Right Ascension and Declination refer to Fig. 10; in this diagram the Ecliptic is not shown, but the First Point of Aries is supposed to be at F. If the hour circle PAC reaches the meridian an hour later than the hour circle PF, then the Right Ascension of all points on PAC is 1 hour. In this way Right Ascension is measured all round the sphere from PF up to 24 hours. CHAPTER X HOW TO MAKE A MODEL OF THE CELESTIAL SPHERE Take a large round-bottomed flask and fill it exactly half full with some blue liquid, such as a mixture of copper sulphate and ammonia, or starch and iodine, or inky water. Cork it up with a tight-fitting cork which has, passing through the middle of it, a piece of thin glass rod. The rod should exactly reach the bottom of the flask when it is corked. Turn the flask upside down and tilt it over so that the...


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Product Details
  • ISBN-13: 9781154692839
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 32
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1154692833
  • Publisher Date: 26 Jun 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 77 gr


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