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 tab≤ sight reduction formulas; and various correction tables for sight reduction. There is a useful concise sight reduction form at the back of the book. Each edition contains data for one year and is published six months or more in advance of the edition year. This book is still the standard resource for marine celestial navigation for the U.S. Navy.