Based on the July 1993 title conference held in Tubingen, Germany, covering historical, philosophical, astronomical, theoretical, and experimental aspects of Mach's Principle. Topics include Mach's criticism of Einstein's reading of his work, nonrelativistic Machian theories, general relativity as a Machian theory, direct particle formulation of Mach's principle, frame dragging, and quantum gravity, with sections on testing Machian effects in laboratory and space experiments and critical reflections. Includes commentaries on papers and discussion between contributors. Annotation c. by Book News, Inc., Portland, Or.