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GP100 The Astronomical Almanac: 2020

A worldwide resource for fundamental astronomical data, the Astronomical Almanac includes contributions from astronomical experts, as well as a wide variety of technical and general astronomical information. This includes:Positions of the Sun, Moon and planets to milli-arcsecond precision.Positions of minor planets and planetary satellites for each year.Data relating to Earth orientation, time-scales and coordinate systems.Sunrise/set, moonrise/set and twilight times.Reference data for stars and stellar systems, observatories and related astronomical constants and techniques.This is a joint publication with the United States Naval Observatory.

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