Astronomical Almanac for the Year 2006 and Its Companion, The Astronomical Almanac Online: Data for Astronomy, Space Sciences, Geodesy, Surveying, Navigation ... (Astronomical Almanac for the Year)

This classic annual guide to the stars, designed in consultation with other astronomers of many countries, provides current, accurate astronomical data for use in the making and reduction of observations and for general purposes. The Astronomical Almanac Online extends the printed version by providing data best presented in machine-readable form. Online data are provided for several years.