Presented is book two in a series of six books in the University of Illinois Astronomy Program which introduces astronomy to upper elementary and junior high school students. This guidebook is concerned with how celestial bodies move in space and how these motions are observed by astronomers. Topics discussed include: a study of the daily motion of the sun, the moon, and the stars; motions of the planets; moving models of the solar system; Kepler's law of planetary motion; and the motion of stars, starpairs, and galaxies. (DS)