Definitions for "Nautical Almanac"
An ephemeris of celestial and navigational data published jointly by Great Britain and the United States.
A book containing all current data: navigational, tidal, astronomical and so on. It is published annually.
An annual publication of the U.S. Naval Observatory and H. M. Nautical Almanac Office, Royal Greenwich Observatory, listing the Greenwich hour angle and declination of various celestial bodies to a precision of 0.1 minute of arc at hourly intervals; time of sunrise, sunset, moonrise, moonset; and other astronomical information useful to navigators. Prior to 1960 separate publications were issued by the two observatories entitled the American Nautical Almanac and the Abridged Nautical Almanac. See American Ephemeris and Nautical Almanac.