The Astronomical Almanac is a joint publication of the U. S. Nautical Almanac Office in the United States (USNO) and Her Majesty's Nautical Almanac Office (HMNAO) in the United Kingdom. The printed version contains precise ephemerides of the Sun, Moon, planets, and satellites, data for eclipses and other astronomical phenomena for a given year, and serves as a world-wide standard for such information. The online version extends the printed version by providing data best presented in machine-readable form.
These pages are available at USNO and HMNAO.