NOTICE TO USERS
Commander, Naval Meteorology and Oceanography Command is consolidating the command's web presence in accordance with Department of Defense (DoD) and Navy guidance. The U.S. Naval Oceanography portal will be the single access point for all public facing Meteorology and Oceanography products and services. This publicly-accessible portal is currently online at http://www.usno.navy.mil and is being populated. In the near future, non-DoD users will be redirected to this portal.
DoD customers can access all operational data, products and services via the NIPRnet Naval Oceanography Portal site at https://oceanography.navy.mil (CAC required).
For over 150 years the United States Nautical Almanac Office has published
The Nautical Almanac, first as part of the American Ephemeris and
Nautical Almanac, and then on its own, to provide the US Navy with a
convenient form of the astronomical data used for celestial navigation. This
book is still the standard resource for marine celestial navigation for the
U.S. Navy.
The history of The Nautical Almanac is found here.
The book 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; and other data. Each edition also contains a sight reduction table; sight reduction formulas; and various correction tables for sight reduction. There is a useful concise sight reduction form at the back of the book. The Nautical Almanac is available 9 months in advance of its edition date.
The book is produced in collaboration with Her Majesty's Nautical Almanac Office in the UK. That Office maintains the copyright on the material it produces.
- Ordering Information contains instructions on how to order the The Nautical Almanac.
- The Depository Libraries around the United States retain a reference copy for each year of publication.
