Date:  2022-10-23

Article ID:  48968

Article 21808 explained how to define the geometry of space by assigning a length to every finite path. This article introduces the geometry of spacetime, with emphasis on flat spacetime (special relativity). The geometry of spacetime includes a distinction between spacelike paths and timelike paths. A spacelike path has an intrinsic length, but a timelike path has an intrinsic duration instead. The journey of a physical object is represented by a path with an intrinsic duration.