Sight Reduction Tables for Air Navigation Pub. No. 249 (HO-249)- Epoch 2015

Celestaire

Published by Celestaire, 2012
ISBN 10: 0979904560 / ISBN 13: 9780979904561
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Synopsis: These tables were designed for air navigation where weight and space are at a premium, however, they are very popular with sailors too due to the fact that Vol. 1 offers a speedier way to compute stars. The way the 6 volumes of 229 were combined into this 3 volume set is this: volumes 2 & 3 cover all latitudes, but work only for declinations from 0° to 29° north or south. This covers the sun, moon, planets, and only those stars whose declinations fall into this range. Volume 1 contains some stars (whose declinations may be more than 29°) that are pre-selected for optimum viewing and direction. This volume is applicable for an 8 year period, centered on its Epoch date. The only drawback to this arrangement, is that it is possible that a star may be observed that is not one of the pre-selected ones, and whose declination is more than 29° north or south. This star, if observed on some unlikely occasion, say through a break in the overcast, could not be computed using the 249 tables. Nevertheless this remains the most popular tabular system in use. Because of the high price and spotty availabliity of the Government editions,Celestaire has reprinted these as Commercial Editions from official Government electronic files or software. They are economical, and sized at 90% of the originals. They have soft instead of hard covers and their smaller size of 8.5 x 11 inches is easier to carry and store. SW 2.1 lbs

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Title: Sight Reduction Tables for Air Navigation ...
Publisher: Celestaire
Publication Date: 2012
Binding: Paperback
Book Condition: Used: Good

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Celestaire
Published by Celestaire (2012)
ISBN 10: 0979904560 ISBN 13: 9780979904561
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Book Description Celestaire, 2012. Paperback. Book Condition: New. book. Bookseller Inventory # M0979904560

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