GP100 The Astronomical Almanac 2020

This publication contains technical and general astronomical information. 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 co -ordinate 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 stellar systems, observatories and related astronomical constants and techniques.