The Practice of Navigation and Nautical Astronomy - Bookswagon
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The Practice of Navigation and Nautical Astronomy

The Practice of Navigation and Nautical 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. 1874 Excerpt: ...27' S., alt. 41 2' W. Azim. N. 111 50' W., or S. 58 10' W. Ex. 2. Lat. 11 12' N., decl. o, alt. 54 30', to the East Azim. S. 73 53' E. When both the lat. and decl. are 0, the object moves on the prime vertical. 2. To find the Azimuth, the Hour-angle being given. 675. (1.) Take half the sum of the pol. dist. and colat., and half the difference. (2.) Add together the log. cot. of half the hour-angle, the log. sec. of the half sum, and log. cos. of the half diff.: the sum (rejecting tens) is the log. tan. of half the sum of the azimuth and another angle A. When the half sum of the pol. dist. and colat. exceeds 90, take the suppl. of the resulting arc for the half sum required. To the log. cot. already employed add the log. cosec. of the half sum, and the log. sine of the half diff.; the sum (rejecting tens) is the log. tan. of half the diff. of the same two angles. (3.) The sum of the resulting half sum and half diff. is the greater cf the said two angles; the difference is the lesser. When the pol. dist. exceeds the colat. the greater of the two angles is the azimuth required; when the pol. dist. is less than the colat., the lesser of the angles is the azimuth required. Ex. 1. Lat. 10 20' N., decl. 22 14' S., hour-angle ih 44TM 17 W.: required the Azimuth. H.Angle Ih44TMi7t 91 16 (suppl.) 5 37 Sum N. 142 3 W. Azimuth (p. dist. exceeds col.) Diff. 40 49 the other Angle, or A. Ex. 2. Lat. 47 11' S., decl. n 18 S., hour-angle 5h iim 20" the Azimuth 91 6, the other angle, or A, 43 52'. Ex. 3. I-'3 5' N., decl. 46 8' N., hour-angle ih 21- 11- E. of Mer. Azim. 33 49'1 JS. 3. To find the Azimuth, the Hour-angle and Altitude being given. 676. Add together the log. sine of the pol. dist. (or log. cos. ni the declin.), the log. sine of the hour-angle, a...


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Product Details
  • ISBN-13: 9781130379006
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 186
  • Spine Width: 10 mm
  • Width: 189 mm
  • ISBN-10: 1130379000
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 340 gr


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