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Article type: Cover
1984 Volume 81 Pages
Cover1-
Published: September 15, 1984
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Article type: Cover
1984 Volume 81 Pages
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Published: September 15, 1984
Released on J-STAGE: July 12, 2017
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[in Japanese]
Article type: Article
1984 Volume 81 Pages
1-
Published: September 15, 1984
Released on J-STAGE: July 12, 2017
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[in Japanese]
Article type: Article
1984 Volume 81 Pages
2-
Published: September 15, 1984
Released on J-STAGE: July 12, 2017
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[in Japanese]
Article type: Article
1984 Volume 81 Pages
3-
Published: September 15, 1984
Released on J-STAGE: July 12, 2017
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Masanaga KITAZAWA
Article type: Article
1984 Volume 81 Pages
4-7
Published: September 15, 1984
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Takashi HIRAIWA
Article type: Article
1984 Volume 81 Pages
8-14
Published: September 15, 1984
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From ancient times, the methods of calculating a ship's position by dead reckoning have been carried out by treating the earth as a sphere, or as a sphere in part and a terrestrial spheroid in part. However, there have arisen some questions concerning the results obtained by using these approximate methods. In his former paper, the author pointed out the problems and described alternate plans concerning plane sailing, parallel sailing, middle latitude sailing and Mercator sailing; moreover, he pointed out the shortcomings of a theory of traverse sailing. In this paper, he examines the usefulness of great circle sailing. As this sailing is an approximate method, it has great significance for calculating the changing points in a course, since we cannot sail on the geodesic line which is the shortest length connecting two points on the terrestrial spheroid. Therefore, the problem is to determine how the sum of the loxodromic distances between changing points approximate the geodesic line distance. Fig. 1〜Fig. 9 show the correcten values for guiding geodesic line distances from great circle distances. Fig. 10〜Fig. 15 show the relationships between the actual sailing distances and the geodesic line distances, when the changing points in the former were all taken at 5 degrees of D. Long. The lengths calculated by Σ(D.L.P.×sec Co.) agree with the gedesic line distances within lg.m. The method used to calculate changing course points on the sphere, as well as to calculate the length between two changing course points on the terrestrial spheroid, is effective in practice because the sum of loxodromic distances approximates the geodesic line distance.
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Akio M. SUGISAKI
Article type: Article
1984 Volume 81 Pages
15-24
Published: September 15, 1984
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Ken SUDA, Tsutomu MAKISHIMA, Susumu KUWASHIMA, Hideki HAGIWARA
Article type: Article
1984 Volume 81 Pages
25-36
Published: September 15, 1984
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Masanori ISHIZUKA
Article type: Article
1984 Volume 81 Pages
37-42
Published: September 15, 1984
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Sanemori KUKITA
Article type: Article
1984 Volume 81 Pages
43-50
Published: September 15, 1984
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Yutaka TANABE
Article type: Article
1984 Volume 81 Pages
51-66
Published: September 15, 1984
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Keisuke INOUE
Article type: Article
1984 Volume 81 Pages
67-71
Published: September 15, 1984
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Yoshio YOSHIDA
Article type: Article
1984 Volume 81 Pages
72-73
Published: September 15, 1984
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Yahei FUJII, Tomomi WAKAO
Article type: Article
1984 Volume 81 Pages
74-79
Published: September 15, 1984
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Article type: Bibliography
1984 Volume 81 Pages
80-83
Published: September 15, 1984
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Article type: Appendix
1984 Volume 81 Pages
84-96
Published: September 15, 1984
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Article type: Cover
1984 Volume 81 Pages
Cover4-
Published: September 15, 1984
Released on J-STAGE: July 12, 2017
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