The Sight Reduction Tables for Air Navigation consist of three volumes of comprehensive tables of altitude and azimuth designed for the rapid reduction of astronomical sights in the air. The volume 1 contains tables for selected stars for all latitudes, calculated for the epoch of 2010.0, and replaces the previous edition calculated for the epoch of 2005.0; it is intended for use for about 5 years, when a new edition based on a later epoch will be issued. Volume 2 for latitudes 0°– 40° and Volume 3 for latitudes 39°– 89° are permanent tables for integral degrees of declination. They provide sights for bodies with declinations within 30° north or south of the equator, which includes the Sun, the Moon, the navigational planets and many of the navigational stars. The time argument in the examples is denoted by UT (Universal Time). It is also known as GMT (Greenwich Mean Time). Sight Reduction Tables for Air Navigation are published in the USA as Pub. No. 249, and in the UK as Rapid Sight Reduction Tables for Navigation AP 3270/NP 303. The National Geospatial-Intelligence Agency (NGA) is responsible for the compilation and composition of these tables. The Nautical Almanac Office of the U.S. Naval Observatory and H.M. Nautical Almanac Office (HMNAO) of the UK Hydrographic Office have cooperated in their design and preparation. Some of the auxiliary tables in this edition were furnished entirely by HMNAO.