The long-awaited second edition of Wil Tirion's superb Sky Atlas 2000.0 offers 43,000 additional stars, with all positions now derived from the Hipparcos database. The Atlas opens out to reveal 28 charts, each one 500 mm wide and 380 mm deep (20 by 15 inches). This large format allows the stars, nebulas and galaxies to be displayed with unrivalled clarity. For this edition improved isophotal maps are used for the Milky Way, and extra charts for crowded areas of the sky have been added. Within the constellations, Flamsteed numbers identify the brighter stars by name, while NGC and Messier numbers are used for non-stellar objects. Colour coding and size graduation is used to visually convey the maximum information on star types and brightnesses. This atlas is an indispensable aid for all users of astronomical telescopes. Copublished with Sky Publishing Corporation.