The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 5 3 2019 11 26 On synchronization of clocks in general space-times On synchronization of clocks in general space-times 159 159 678 FA M. R. H Khajehpour R. Mansouri Journal Article 2019 11 26   Einstein and transport synchronizations of infinitesimally spaced and distant clocks are considered in a general Riemannian space-time. 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.   Einstein and transport synchronizations of infinitesimally spaced and distant clocks are considered in a general Riemannian space-time. 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. https://ijpr.iut.ac.ir/article_678_9fe8593a8a330607d76796b35c64c600.pdf