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Here is the first book in any language on this important branch of double star astronomy. It is both an introduction to the study of eclipsing variables and an exhaustive survey of methods for deciphering the nature of such binary systems from an analysis of their light waves. Zdenek Kopal has collected all the relevant material (heretofore scattered in American and foreign publications) and presents it in a concise and coherent form. His study provides a manual of known facts for anyone who intends to apply them in practice, and directs prospective investigators to the front lines of independent research.