The invention relates to a method of synchronizing the clock of different clusters including a first cluster (1) and a second cluster (2) which are connected by means of a connecting element (3) wherein the timing of the second cluster (2) is at least almost aligned to the timing of the first cluster (1), wherein the timing of the second cluster is determined by a node (4) of the second cluster which is connected to a reference node of the first cluster and wherein the node of the second cluster synchronizes itself with the reference node's timing and transfers an offset correction to the second cluster.