Some navigation and almanac algorithms
By: Rex H. Shudde
Contributors: Naval Postgraduate School (U.S.)
Publisher: Naval Postgraduate School
Published: 1985
Place of publication: Monterey, Calif
Language: eng
Number of pages: 53
Subjects: Nautical almanacs; Navigation; Algorithms; Ephemerides; Computer programs
Other titles: NPS-55-85-023
Description: This report presents a detailed discussion of the use of the general spherical triangle as a means of eliminating the many special cases of quadrant determination that plague most navigation computations and steal memory from computer programs. Also included are two programs, NAVALGOR and NAVEPHM which are written for the Radio Shack TRS-80 Model 4 Computer. NAVALGOR implements three sets of computational procedures: direct solution algorithms for speroid and spherical earth models, inverse solution algorithms for spheroid and spherical earth models, and rhumb line approximations to great circle routes. NAVEPHM implements a procedure for the determination of the position of the Sun, Moon and navigational planets that reproduce 'The Nautical Almanac' and 'The Air Almanac' to within 0.2'. Keywords include: Navigation, Air Almanac, Ephemeris, Spheroid Earth, Spherical Triangle, Almanac, Nautical Almanac, Great Circle, Rhumb Line, and General Spherical Triangle.
Notes: Cover title.

"NPS-55-85-023"--Cover.

"September 1985"--Cover.

"Prepared for: Chief of Naval Operations, OP-953C2, Washington, D.C. 20350."

Includes bibliographical references (p. 50).

"Approved for public release; distribution is unlimited"--Cover.

Technical report; 1985.

ck/ 4/2/09.