An accessible introduction to elementary astronomy presents Earth's place among planetary bodies and explains the forces that govern their motions. It surveys the Sun, Moon, planets, comets, meteorites, and satellites; outlines observational and measurement techniques including photographic and spectral methods; describes different kinds of stars, clusters, and the Milky Way; and traces the development of astronomical knowledge from early observations to contemporary practice. Clear, nontechnical explanations and illustrations aim to make complex concepts intelligible to beginners.