Lectures in Navigation
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Lectures in Navigation

Lectures in Navigation


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Excerpt: ...however, the diagram is correct. The last case is where you are, say, 10 N of the sun (your zenith Distance is 10 ) and the sun is in 20 S declination. In that case you would have to subtract your zenith distance from the sun's declination to get your latitude, for the sun's latitude (its declination) is greater than yours. Now from these three cases we deduce the following directions, which put in your Note-Book: Begin to measure the altitude of the sun shortly before noon. By bringing its image down to the horizon, you can detect when its altitude stops increasing and starts to decrease. At that instant the sun is on your meridian, it is noon at the ship, and the angle you read from your sextant is the meridian altitude of the sun. To work out your latitude, name the meridian altitude S if the sun is south of you and N if north of you. Correct the observed altitude to a true altitude by Table 46. If the altitude is S, the Zenith Distance is N or vice versa. (Note to Instructor: If the sun is South of you, you are North of the sun and vice versa.) Correct the declination for the proper G.M.T. as shown by chronometer (corrected). If zenith distance and declination are both North or both South, add them and the sum will be the latitude, N or S as indicated. If one is N, and the other S, subtract the less from the greater and the result will be the latitude in, named N or S after the greater. Example: At sea June 15th, observed altitude of 71 15 S, IE - 47, HE 25 ft. CT 3h 34m 15s P.M. Required latitude of ship. Pg 67 71 15' 00 S IE - 47' Corr. - 36 24 HE + 10 36 ------------ ------ 70 38' 36" S Corr. - 36' 24" - 90 00 00 ------------ ZD 19 21' 24" N Dec. 23 17 15 N (G.M.T. June 15 3h 34m 15s) ------------ Lat. 42 38' 39" N ------------ Assign for Night Work or to be worked in class room such examples as the following: 1. June 1st, 1919. 33 50' 00" S. G.M.T. 8h 55m 44s. HE 20 ft. IE + 4' 3." Required...


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Product Details
  • ISBN-13: 9781153806275
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 50
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1153806274
  • Publisher Date: 01 Aug 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 159 gr


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