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Complete guide to astronomers and astronomical terms and theories. The Firefly Astronomy Dictionary is an invaluable reference for understanding the major terms and theories used in astronomy. There are 1,000 up-to-date entries that are extensively cross-referenced. This dictionary also provides concise coverage of the many new developments in space exploration. Two hundred color illustrations and 35 tables provide concise details about the planets and stars. Written in a style that is both interesting and accessible, its compact size is ideal for a handy reference and study guide. As well as defining scientific terms and explaining theories, the dictionary provides brief biographies of over 100 famous astronomers including Ptolemy, Galileo, Johann Kepler, Copernicus and Edwin Hubble. An appendix provides tables of symbols and mathematical units and calculations used in astronomy. From aberration to Zwicky, the Firefly Astronomy Dictionary is an invaluable reference for active observers, armchair enthusiasts and students.