An Event Graph in Special Relativity

We present a graph to illustrate a series of events within the theory of special relativity. This spacetime diagram provides both the so-called proper time and calendar time, in addition to one space parameter. All parameters of the graph are given in time units, and we also relate the graph to a time vector in two dimensions. The approach considers chains of events having a piecewise constant velocity and is exemplified, e.g. by versions of the twin paradox