- En langue anglaise
- Version : papier, numérique ?
- version papier
The Astronomical'al'anac contains a wide variety of both technical'and general'astronomical information. The book is a worldwide resource for fundamental'astronomical data and the flagship publication of the Nautical'al'anac Office at the US Naval Observatory and Her Majesty's Nautical'al'anac Office at the UKHO including contributions from astronomical experts worldwide. It contains positions of the Sun, Moon and planets to milli-arcsecond precision, positions of minor planets and planetary satellites for each year together with data relating to Earth orientation, time-scales and coordinate systems. Phenomena including eclipses of the Sun and Moon, sunrise/set, moonrise/set and twilight times are provided'as well'as fundamental'astronomical reference data for stars and s'el'ar systems, observatories and related'astronomical constants and techniques.