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. 1807 Excerpt: ...in the south part of the horizon; height of the eye 17 feet. Required the latitude? A method very often practised at sea, especially by coasters, is to correct the observed altitude, by adding 12', and from thence, and the declination, the latitude is found: or, subtract the altitude from 89" 48', and the declination ...
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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. 1807 Excerpt: ...in the south part of the horizon; height of the eye 17 feet. Required the latitude? A method very often practised at sea, especially by coasters, is to correct the observed altitude, by adding 12', and from thence, and the declination, the latitude is found: or, subtract the altitude from 89" 48', and the declination applied to the remainder will give the latitude. These methods may, no doubt, give the latitude tolerably exact in some cases; but, in others, the mariner may be deceived above half a degree; and, in any case, they are seldom free from error. Depression of the sun's centre below the horizon 0 53 S. Zenith distance 90 53 N. Declination 23 28 S. Latitude 67 25 N. IV. May 30th, 1808, in longitude 130 W. the meridian altitude of the sun's apparent lower limb by a back observation was 49 38', the observer being south of the sun, and height of the eye 20 feet. Required the latitude? The dip, in Table XXI, answers to a free horizon only. If, therefore, at the time when an observation is wanted, land intervenes between the distant horizon and the ship, and if the sun be brought down to the line of separation of the sea and land, the observed altitude will evidently be greater than if no obstruction had intervened. Hence, a dip different from that contained in the above table, must be used; which new dip, or correction, will, thereforei be greater than the former, and will increase the nearer the ship is to the land. If, therefore, the distance of the ship from the land be known, which may be easily found by various methods, or which seamen can estimate with sufficient accuracy for this purpose, the dip is to be taken from Table XXI, under the height of the observer above the sea at the top, and opposite to the distance in the side column. June 4th...
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Add this copy of The Complete Navigator; Or, an Easy and Familiar Guide to cart. $109.01, like new condition, Sold by Phatpocket Limited rated 4.0 out of 5 stars, ships from Waltham Abbey, ESSEX, UNITED KINGDOM, published 2012 by Rarebooksclub.com.
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