The book is a comprehensive guide to the stars and celestial objects visible in binoculars, or an average-sized telescope. This edition features updated and extended text, improved sky charts, and new diagrams and photographs. It includes: unique yearly planetary data, available as a downloadable web resource; monthly sky maps of the northern and southern hemispheres; descriptions of the 88 constellations and their stars; detailed information on stars, nebulae, galaxies, the Moon and the Solar System; and practical advice on choosing and using binoculars and telescopes.