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Lunar and Horary Tables for Neru and Concise Methods of Performing the Calculations

Lunar and Horary Tables for Neru and Concise Methods of Performing the Calculations


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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. 1845 Excerpt: ...sum 6h. Om. 30s. is the error of No. 2 for mean noon at Greenwich. When the Rates and Errors of several watches are to be deduced from the same observations, they should each be compared with the one of which the time is noted, as near to the time of observation as possible, that the rates, &c. of the other watches may not be affected by any irregularity in the going of that one by which the time is taken. SECOND METHOD. To find the Error and Rate of a Chronometer by altitudes of a fixed Star, taken by means of an artificial horizon. RULE. 1. Choose a Star, of which the declination is of the same name as the latitude of the place of observation, find, in Table IX. the altitude by which the horary angle may be found with the greatest accuracy, and let the altitude of the Star be observed when the angle on the instrument is as near to twice the altitude found in Table IX. as possible; then take a set of altitudes of the Star, with the corresponding times, by the Chronometer, in the same manner as in the last method. 2. To the mean double altitude, apply the index error of the Sextant, which will give twice the apparent altitude; from the apparent altitude subtract the correction of the Star in altitude, Table VI. the remainder will be the true altitude of the Star. 3. Proceed by Problem II., and find the mean time; the difference between this and the mean of the times of observation by the Chronometer, will be its error for mean time, and by finding the error at some subsequent time, the rate is deduced as before. EXAMPLE. 1844. Jan. Qd. 8h. M. T., in lat. 56 34' N., long. 2 35' W., the following alts, of the Castor were observed East of meridian, in an artificial horizon, with the corresponding times by Chronometer, to find its error for M. T., error of ...


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Product Details
  • ISBN-13: 9781130111552
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 32
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130111555
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 77 gr


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