Nga

Rapid Sight Reduction Tables Volume 2. Nga 第1 版本

The Rapid Sight Reduction Tables for Navigation consist of three volumes of comprehensive tables of altitude and azimuth designed for the rapid reduction of astronomical sights. Volume 1 contains tables for selected stars for all latitudes, calculated for the epoch of 2010.0, it is intended for use for 5 years, when a new edition 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. Sight Reduction Tables for Navigation are published in the USA as Sight Reduction Tables for Air Navigation 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. The content and format of these three volumes may not be changed without the approval of Working Party 70 of the Air Standardization Coordinating Committee.