m r h khajehpour - Institute for Advanced Studies in Basic Sciences, Zanjan, Iran
r mansouri - Department of Physics, Sharif University of Technology, Tehran, Iran

Einstein and transport synchronizations of infinitesimally spaced and distant clocks are considered in a general Riemannian spacetime. It is shown that infinitesimally spaced clocks can always be synchronized. In general one can not find observers for whom distant clock are Einstein synchronized; but transport synchronized observers do always exit. Whenever both procedures are possible, they are equivalent.

relativity, synchronization, riem annian, space-time