This book, explores the conceptual foundations of Einstein's theory of relativity: the fascinating, yet tangled, web of philosophical, mathematical, and physical ideas that is the source of the theory's enduring philosophical interest. Originally published in 1983. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905. "An excellent introduction to the philosophies of space and time. Foundations of Space-Time Theories is the result of the author's intellectual struggle to clarify the foundations of relativity theory for himself, and it will deeply influence all future thinking about the philosophy of space and time." ― The New York Times Book Review