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An Introduction to Practical Astronomy and with a Collection of Astronomical Tables

An Introduction to Practical Astronomy and with a Collection of Astronomical Tables


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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. 1886 Excerpt: ...the sun's right ascension at noon, March 21st? In this case we shall have the proportion 16" 33."29+7' 7."54:7' 7."54:: 3m. 38.23s.: 65.67s. Therefore the sun's right ascension at noon, March 21st, was Oh. 1m. 5.67s. Ex. 2. On the 22d of September, 1851, at noon, the sun's declination observed at Greenwich was 3' 51."53 N., and on the 23d it was 1O' 33."76 S.; also the sidereal interval of the transits was 24h. 3m. 36.13s. What was the sun's right ascension at noon, September 23d? Ans. 12h. 3m. 0.52s. Ex. 3. On the 22d of September, 1846, at noon, the sun's declination, observed at Washington, was 17' 2."80 N., and on the 23d it was 6' 21."56 S.; also, the sidereal interval of the transits was 24h. 3m. 35.50s. What was the sun's right ascension at the second observation? Ans. 12h. Om. 58.55s. (196.) These computations should be made both for March and September, when the sun crosses the equator. If the sidereal clock were correct, it would be found to indicate 12 hours when the sun is on the meridian at the autumnal equinox; from which we infer that the two equinoctial points are distant from one another 180 degrees. If now we observe some star which passes the meridian about the same time with the vernal equinox (as, for example, o Andromedse), its right ascension will be known; and having settled the right ascension of one star, the right ascension of other stars may thence be deduced. Thus, taking the apparent right ascension of a Andromedse on January 31,1853, to be Oh. Om. 46.10s., let the index of the clock be set to that time when a Andromedse is on the meridional wire of the transit telescope. The clock, if it goes correctly, will denote the right ascension of other stars when they are bisected by the meridion...


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Product Details
  • ISBN-13: 9781130846812
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 90
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1130846814
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 177 gr

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