Safer Seas Are the Result of U.S. and U.K. Naval Collaboration
The U.S. Naval Observatory and Her Majesty’s Nautical Almanac Office collaborate to compute, from fundamental astronomical reference data, the position, brightness, and other observable characteristics of celestial bodies, as well as the circumstances of astronomical phenomena. This information is of critical importance to navigation, military operations planning, scientific research, surveying and everyday activities of the maritime community, and sailors perhaps such as you.
This updated, annual book is the standard resource for marine celestial navigation for the U.S. Navy and is produced in collaboration with Her Majesty's Nautical Almanac Office, part of the U.K. Hydrographic Office. That Office maintains the copyright on the material it produces.
The Nautical Almanac contains the following data tabulated at hourly intervals to a precision of 0.1 arcminute:
the Greenwich hour angle and declination of the Sun, Moon, and navigational planets
the Greenwich hour angle of Aries
positions of the navigational stars; rise and set times of the Sun and Moon for a range of latitudes