Nautical Almanac - Tapa dura

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. 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.

ABOUT THE AUTHOR/ABOUT THE AGENCY:
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. The products they produce - publications, software, algorithms, and expertise - are used by the U.S. and British Navy and the other armed services, civilian government agencies, the scientific research community, and the public. Their products are regarded as benchmark standards throughout the world.