The indispensable reference book for astronomers, professional and amateur alike.The 2001 edition includes an extensive range of specially-commissioned articles by some of the world's top astronomers (including the latest findings on Jupiter's moons from the Galileo spacecraft) as well as an authoritative collection of charts and astronomical data, and a month-by-month guide to everything the stargazer can expect to see in the coming year: planets, eclipses, comets, meteors, nebulae and phases of the moon.