National Audubon Society Pocket Guide: Constellations (National Audubon Society Pocket Guides)A portable, comprehensive field guide brimming with concise descriptions and stunning color photographs, and designed to fit into your back pocket from the go to reference source for over 18 million nature lovers. Human beings have always looked to the skies: as clock and calendar, to divine the future, for spiritual guidance. Even today, astronomers study the night sky for the key to the mysteries of the universe, as they literally look back in time