Her Majesty's Nautical Almanac Office
The Nautical Almanac contains tabulations of the Sun, Moon navigational planets and stars for use in the determination of position at sea from sextant observations. In addition, it gives times of sunrise, sunset, twilights, moonrise and moonset, phases of the Moon and eclipses of the Sun and Moon for use in the planning of observations. All the necessary interpolation and altitude correction tables are provided as well as pole star tables and diagrams and notes for the identification of stars and planets. Information on standard times for most countries around the world is provided. A concise set of sight reduction tables and sight reduction form are also included.
This web page describe the publications produced by the UKHO in conjunction with HM Nautical Almanac Office.
The Office produces astronomical data suitable for a wide range of users, including professional and amateur astronomers, mariners, aviators, surveyors, the Armed Forces, the Police, lawyers, religious groups, architects, schools, diary and calendar manufacturers, photographers and film crews. In fact, anyone requiring astronomical information may require our services.
HMNAO is jointly responsible for producing the annual volumes of The Astronomical Almanac, The Nautical Almanac and Astronomical Phenomena in collaboration with our colleagues at the US Nautical Almanac Office within the Astronomical Applications Department of the US Naval Observatory. HMNAO also produces The Star Almanac, NavPac and Compact Data, The UK Air Almanac, Rapid Sight Reduction Tables for Navigation and Planetary and Lunar Coordinates in the United Kingdom.