2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/154838While Einstein clocks synchronization process is performed, one has a well defined region in which the clocks are synchronized and another one in which the clocks are not yet synchronized. The frontier between them evolves differently from the perspective of observers in relative motion. A discussion is conducted upon direct observation of the phenomenon and Minkowski diagrams.12 pages, 15 figures,submitted on Feb/14/2008General Physicstext