100 Problems in Celestial Navigation.100 Problems in Celestial Navigation Leonard Gray Paradise Cay Publications PO Box 29, Arcata, CA 95518-0029 0939837331 $19.95 1-800-736-4509 www.paracay.com Even in a world with accurate and cheap GPS receivers, traditional navigation with a sextant sextant, instrument for measuring the altitude of the sun or another celestial body; such measurements can then be used to determine the observer's geographical position or for other navigational, surveying, or astronomical applications. , an almanac almanac, originally, a calendar with notations of astronomical and other data. Almanacs have been known in simple form almost since the invention of writing, for they served to record religious feasts, seasonal changes, and the like. , and a book of tables is still an important skill--sometimes batteries go dead or electronic devices fail, especially in salt air! Written by experienced navigator Leonard Gray, 100 Problems in Celestial Navigation: Self Contained--With Answers is a compendium of realistic navigation problems, including excerpts of all required Nautical Almanac Nautical Almanac: see ephemeris. pages and sight-reduction tables, complete with answers and explanations. These problems cover all regularly encountered navigation situations, as well as those that are only occasionally used and often forgotten, such as backsight Back´sight` n. 1. (Surv.) The reading of the leveling staff in its unchanged position when the leveling instrument has been taken to a new position; a sight directed backwards to a station previously occupied. Cf. , shooting and unknown body, finding Venus in daylight, and storm avoidance. A superb manual for safely practicing and honing Honing could refer to
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