Pub No. 229 Vol 1- 4 : Sight Reduction Tables for Marine Navigation Latitudes 0-60, Inclusive I 4 Volumes

Sight reduction tables for the marine navigator published by the Defense Mapping Agency Hydrographic Center. Full set includes six volumes designed to facilitate the practice of celestial navigation at sea by the Marcq Saint Hilaire or intercept method. The tabular data are the solutions of navigational triangle of which two sides and the included angle are known and it is necessary to find the values of the third side and adjacent angle. The tables, intended for use with The Nautical Almanac, are designed for precise interpolation of altitude for declination by means of interpolation tables which facilitate linear interpolation and provide additionally for the effect of second differences when required.