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The Program Development of the Sight Reduction Tables for Marine Navigation
Chih-Li Chen;Tsung-Hsuan Hsieh;Szu-Tsen Liu
|Contributors: ||NTOU:Department of Merchant Marine|
Intercept method;the sight reduction tables for marine navigation;the sight reduction program for marine navigation
|Issue Date: ||2011-10-20T08:32:47Z
Abstract:The intercept method is mainly adopted in the field of sight reduction. Before the calculator had not been developed, navigators usually used the sight reduction tables as a tool to solve the calculating problem of the intercept method. However; the sight reduction tables are proposed for the purpose of compressing tables and tabular interpolation such that they always lead to inaccuracy of the results or limitation of their further applications. Besides, when the special case that the celestial body is above the zenith is encountered, the degree of azimuth is 90 shown in tables and it usually confuses the beginner. In this article, we do not only discuss the formulae of sight reduction tables and solve problems by consulting tables, but also illustrate the judgment of azimuth when the celestial body is above the zenith. Finally, the formulae are adopted to develop a sight reduction program for marine navigation. This self-developed program is validated with several examples in artificial process. Further more, the error and warning message can automatically appear in the special case and the program greatly improves expressions of the sight reduction tables.
|Relation: ||18(1), pp.1-19|
|Appears in Collections:||[商船學系] 期刊論文|
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