Sight Reduction Tables for Air Navigation Pub. No. 249 Volumes I, II & III (HO-249) - Epoch 2025 (PUB. H.O. 249)
Year: 2020 Language: english Author: HO Format: PDF Quality: eBook Pages count: Multiple Description: 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.
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Sight Reduction Tables for Air Navigation Pub. No. 249 Volumes I, II & III (HO-249) - Epoch 2025 (PUB. H.O. 249)
Language: english
Author: HO
Format: PDF
Quality: eBook
Pages count: Multiple
Description: 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.
Contents
Vol. 1 - Sight Reduction Tables for Air Navigation (Selected stars)Vol. 2 - Sight Reduction Tables LATITUDES 0° − 40° , DECLINATIONS 0° − 29°
Vol. 3 - Sight Reduction Tables LATITUDES 39°—89°, DECLINATIONS 0°—29°
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