New tables to facilitate the practice of great circle sailing; together with an application of the theory of the great circle on the globe to the ... by a scale of great circles on a blank chart - Tapa blanda

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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. 1857 Excerpt: ...than 90, take for that distance the supplement of the angle found by the Table Of The Log. Cosines. Find in the same manner the spherical distance between the other place and the said Intersection. If the given places are on the same side of the Equator, subtract the shorter of the found distances from the greater, and reduce the difference into minutes; then this quantity of minutes expresses the required distance in sea miles. But if the given places are on opposite sides, add together the two found distances, ana reduce the sum into minutes; then this quantity of minutes expresses the required distance in sea miles. Ex. 1. To find by calculation the Spher. Dist. between St. Helena and C Horn. Ex. 1, 1. Page 22, (X). Hy means of St. Helena's By means of C. Horn's Long, from the Inters. 1033' W. log. cos. 9-992(1 Long, from the Inters. 72" 5' W. log. cos. 9-4880 lat. I555' log. cos. 9-9839 lat. 55 9' log. cos. 9-7477 Spher. Dist. fr. the Int. 13" 1' log. cos. 9-9756 Spher. Dist. fr. the Int. 80" 0' log. cos. 9-2357 St. Helena's Spherical Distance from the Inters. 19 1 Spher. Dist. between St Helena and C. Horn (diff.) 61 4' = 3664 miles. Ex. 2. To find by calculation the Spherical Distance between the ship's place in the entrance of the English Channel, lat. 49 6' N., Long. 5 2' W. and New York. Ex. 2, 1. Page 23, (XI). By means of the adopted place's (Engl. Channel) By means of New York's Long, from the Inters. 68"23' W. log, cos. 9-5695 Long, from the Inters. 1S613' W. log. cos. 9-8585 lat. 49 6' log, cos. 9-8161 lat. 4o4a' log. cos. 9-8797 Spher. Dist. fr. the Int. 7556' log. cos. 9-3756 Spher. Dist. fr. the Int. 56"49' log. cos. 9-7392 Supplement 123 11 The adopted place's Spher. Dist. from the Inters. 75 56 Spher. Dist. betwee...