The fourth edition of this best-selling field guide was revised and updated, and each printing brings further updates with the latest information. As of the 16th printing (December 2018), most of the time-sensitive material has been updated for the next decade. Twenty-four color Monthly Sky Maps show exactly what you'll see when facing north or south in the night sky. Fifty-two color Atlas Charts cover the entire sky, including close-ups of areas of special interest, such as the Pleiades and the Orion Nebula. Two dozen pages cover the August 21, 2017, total solar eclipse whose path crossed the continental United States, and other aspects of recent and future solar eclipses.