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The Practice of Navigation and Nautical Astronomy

The Practice of Navigation and Nautical Astronomy


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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ... and greater that 170, take the cos. and sin. to 30," because the neglect of this may make a sensible error in the Hour-angle. Log. sine square, Table 69, is ibe same as the log. havrrsine of Inman's Table. p. Errort of the. Hour-Angle. 615. The following rules give, very nearly, the effect of 1' error in tl.e alt., lat., and pol. dist., and therefore for any small number of min. or sec. in the like proportion: --(1.) Error of hour-angle, or time, due to 1' error of alt. Add together the parts for 30" of the cos. and sine: the sum, divided by the parts for 1 (Tab. 69), gives the error required. When the alt. is too small, the hour-angle is too great; when the alt. is too great, the hour-angle is too small. (2.) Error of hour-angle, or time, due to 1' error of lat.f Multiply the parts for 30" of the sec. by 2, and add the parts for the sine; under the sum put the parts for 30" of the cos., and take the diff.; divide this diff. by the parts for 1. When the lat. and true bearing are of the same names, the errors of the hour-angle and lat. are of the same kind; when of contrary names, of contrary kinds. Ex. In N. Lat., if the sun is to the N. of E. or W, and the Lat. employed is too great, the computed hour-angle will be too great; if the sun is to the S., in the same case too mall. (3.) Error of time, or hour-angle, due to 1' error of pol. dist. Multiply the parts for 30" of the cosec. by 2, and add the parts for 30" of the cos.; under the sum put the parts for 30" of the sine; take the diff., and divide it by the parts for 1. When the parts for 30" of the sine are less than the sum over them, the error of the hour-angle is of the contrary kind to that of the pol. dist.; when greater, of the same kind....


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Product Details
  • ISBN-13: 9781152709980
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 204
  • Spine Width: 11 mm
  • Width: 189 mm
  • ISBN-10: 1152709984
  • Publisher Date: 01 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 372 gr


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