Chapter32 Relativity 32-4 Simultaneity(P737-739) Event An event is something that happens, to which an observer can assign (favE) three space coordinates and one time coordinate An event does not"belong to a particular inertial reference trame. anyone in any reference frame may detect it and assign space-time coordinates to it Different observers will assign different space-time coordinates to the same event32-4 Simultaneity (P737-739) An event is something that happens, to which an observer can assign（指派） three space coordinates and one time coordinate. Event An event does not “belong” to a particular inertial reference frame. Anyone in any reference frame may detect it and assign space-time coordinates to it. Different observers will assign different space-time coordinates to the same event