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Simple Elements of Navigation

Simple Elements of Navigation


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About the Book

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. 1890 Excerpt: ...brings us now to the most important problem in navigation, and one which is universally used at sea, called " a sumner." This method consists in working the observation, when the latitude is uncertain, with two assumed latitudes, the one a little greater and the other a little less than the latitude we are supposed to be in, by which one observation for time enables us to find the bearing of land, and two observations, between which the sun has changed its bearing, will give us both the latitude and longitude provided the chronometer is right or its error and rate are known. Circles of Equal Altitudes. At any given instant the sun is vertically above some point on the earth's surface. At this spot an observer with a sextant would find the true altitude of the sun's centre to be 90 degrees. If, however, the observer should shift his position away from the sun, its distance from his zenith would of course become greater and its altitude less. He would then be situated upon a small circle the centre of which would be the spot under the sun. All persons on that circle would have the sun at an equal altitude. Finally, when he came to the horizon, all points on the circle would have the sun in the horizon. These circles of equal altitudes cut the various parallels of latitude and meridians at different angles. Near the east and west points the circles run up and down nearly with the meridians; so that if the observer were at the east or west points of the circle it would make little difference whether the latitude were exact or not, for there the longitude remains nearly the same for a long distance in latitude. Near the north and south points the circles run nearly east and west with the parallels of latitude; so that if he were at one of those points ...


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Product Details
  • ISBN-13: 9781152605213
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 30
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1152605216
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 73 gr


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