Sight Reduction Tables for Air Navigation Pub. No. 249

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

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 0Â° to 29Â° 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 29Â°) 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 29Â° 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
Country USA
Manufacturer Celestaire
Binding Paperback
EANs 9780979904561
ReleaseDate 0000-00-00

Country	USA
Manufacturer	Celestaire
Binding	Paperback
EANs	9780979904561
ReleaseDate	0000-00-00

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

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