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The Elements of Theoretical and Descriptive Astronomy, for the Use of Colleges and Academies

The Elements of Theoretical and Descriptive Astronomy, for the Use of Colleges and Academies


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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. 1890 Excerpt: ...greatest number of both kinds of eclipses in a year is seven; the usual number is four. Although the annual number of solar eclipses throughout the whole earth is the greater, yet at any one place more lunar eclipses are visible than solar. The reason of this is that a lunar eclipse, when it does occur, is visible over an entire hemisphere, while the area within which a solar eclipse is visible is very much more limited. OCCULTATIONS. 164. An occultation of a planet or a star will occur whenever the planet or star is so situated in latitude as to allow the moon to come in between it and the earth. In order to determine the limit of a planet's latitude within which an occultation of the planet is possible, let us refer to Fig. 61. In this figure, E is the A II O Fig. 61. centre of the earth, P that of a planet, and M that of the moon. An occultation will occur when the moon comes between the tangent lines GB and AH. Let EC be the plane of the ecliptic. PEC is then the geocentric latitude of the planet, and MEC that of the moon. We have, PEC = PEG + GET) + DEM + MEC, and also, GET) = EBB--EGB. Now, PEG is the planet's semi-diameter, EGB its horizontal parallax, BEM the moon's semi-diameter, EBB its horizontal parallax, and MEC, as above stated, its latitude. The value OCCULT A.T10NS. 145 of PEC, therefore, can very readily be obtained. If P, instead of representing a planet, represents a star, the distance PE becomes so great that AH and BO are sensibly parallel, and the star's parallax and semi-diameter reduce to zero. In this case the greatest value of PEC, within which an occultation can occur, will be the sum of 5 20' 6," 61' 32," and 16' 45," which is 6 38' 23." Since the moon moves from west to east, the occultation always takes plac...


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Product Details
  • ISBN-13: 9781152648227
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 78
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1152648225
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 154 gr

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