Sight Reduction Tables H.O. 229, Vol. 4: Latitudes 45-60
by National Imagery and Mapping Agency
Volume 4 for latitudes 45 to 60. Inspection tables of precomputed altitudes and azmuths used for reducing sights to solve for position. Each volume contains data for a 16 degree band of latitude north or south with a 1 degree overlap between volumes. Permits the reduction of an observation of any navigational body. Includes a simple approach to star identification.