NGA Sight Reduction Tables

The Sight Reduction Tables for Marine Navigation (Pub 229) is published in six volumes, each of which contains two-eight degree zones of latitude with a one-degree overlap between volumes. They are designed to facilitate the practice of celestial navigation at sea. The tables are primarily used with the intercept method of sight reduction by entering arguments of latitude, declination, and local hour angle and obtaining tabulated altitudes and azimuth angles. The tables are prepared by NIMA on an as needed basis.
Volume 1: Latitudes 0° – 15°, Inclusive
Volume 2: Latitudes 15° – 30°, Inclusive
Volume 3: Latitudes 30° – 45°, Inclusive
Volume 4: Latitudes 45° – 60°, Inclusive
Volume 5: Latitudes 60° – 75°, Inclusive
Volume 6: Latitudes 75° – 90°, Inclusive

The Sight Reduction Tables for Air Navigation are published in three volumes. Volume I, used by both the marine and air navigator, contains the altitude and azimuth values of seven selected stars for the complete ranges of latitude and hour angle of Aries. These seven stars represent the best selection for observation at any given position and time, and provide the data for presetting instruments before observation and for sight reduction afterwards. Volumes II and III cover latitudes 0-40 and 39-89 respectively and are primarily used by the air navigator in conjunction with observations of celestial bodies to calculate the geographic position of the observer.
Volume 1: (Selected Stars) 2020 Edition
Volume 2: Latitudes 0° to 40° Declinations 0° to 29° (2001 Reprint)
Volume 3: Latitudes 39° to 89° Declinations 0° to 29° (2001 Reprint)

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