2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34046The nature of time vis-a-vis relativity is critically examined. Based on the author's space-time interaction hypothesis of late 1970's, cosmological model with time-varying velocity of light is discussed.Prepared for Gravity Research Foundation Award 2001. Report IONP-5-2001General Relativity and Quantum Cosmologytext