2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/157708We briefly review the history of Mach's principle and discuss its significance in the light of modern physics.20 pages; v2: improved version published as the second chapter of The Measurement of Gravitomagnetism: A Challenging Enterprise, edited by L. Iorio (Nova Science, New York, 2007), pp. 13-25History and Philosophy of PhysicsAstrophysicsGeneral Relativity and Quantum CosmologyGeneral Physicstext