Ruggles (archaeoastronomy, U. of Leicester, England) assembles information from around the world about the beliefs and practices concerning the sky in the past, especially in prehistory, and the uses to which people put their knowledge of the sky. The topics range broadly, for example altitude, Celtic calendar, medicine wheels, pyramids of Gaza, statistical analysis, and Alexander Thom (1894-1985). Each entry is cross-reference to others, and cites mostly tertiary sources for further reading. Indexes are topical, geographical, chronological, and cultural. The glossary does not indicate pronunciation.