Pub No 249 Vol 1 star sight reduction form - The Nautical Almanac 2025

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The document is a detailed guide on star sight reduction procedures, specifically using the star Alpheratz for navigation. It includes instructions on recording sighting data, calculating corrections for index error and dip, determining apparent height, and computing Greenwich Hour Angle (GHA) and Local Hour Angle (LHA). The document also provides tables for altitude corrections and examples of calculations necessary for accurate celestial navigation.
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249, Sight Reduction Tables for Air Navigation, contains values of the altitude, to the nearest minute of arc, and the true azimuth, to the nearest degree, of seven selected stars for the complete ranges of Latitude and Local Hour Angle of Aries covering the entire globe and all possible dates for the decade centered
On the Nautical Almanac star chart in Lat. 30 and on the local sidereal time line 12h, place the curves and orient on the north-south line; at once every star east or west of the meridian is visible, indicating at a glance hour angle, altitude, and azimuth.
The Sight Reduction Tables for Air Navigation are published in three separate Volumes. Volume I, used by both the marine and air navigator, contains altitude (to the nearest minutes) and true azimuth values of seven selected stars for the complete ranges of latitude and hour angle of Aries.
In a quarterly, periodical, newsletter, or literary journal, the volume number refers to the number of years a journal has been in publication, while the issue number refers to the number of individual publications during the year. You must provide exact volume and issue numbers when creating citations.
The Sight Reduction Tables for Air Navigation (Pub 249) consist of three volumes of comprehensive tables of altitude and azimuth designed for the rapid reduction of astronomical sights in the air.

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Book overview 1 offers a speedier way to compute stars. The way the 6 volumes of 229 were combined into this 3 volume set is 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.

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by VK Abalakin 1979 Publication No. 249, volume 1, Sight Reduction Tables for Air Navigation, was calculated and prepared by the Defense Mapping Agency Hydrographic Center

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by GA Motte 1972 publication entitled Sight Reduction Tables for Marine Navigation The approximate time of star sights can be extracted from the Nautical A/manac: it is

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Possible Worlds and Other Essays

Mar 28, 2016 But the nautical almanac could now be kept up to date (or rather three years ahead) by a few calculators whose results were checked by a

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