2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/85055Based on two previous papers, the physical meaning of synchronization and simultaneity as is presented in Einstein's Special Relativity paper of 1905 is reconsidered. We follow Einstein's argumentation to introduce a criterium of synchronization and for the same arguments we arrive at a different criterium for synchronization. From that we conclude that simultaneity is absolute.11 pages, 0 figuresGeneral Physicstext