A Dynamic, Three-dimensional Universe of Passage

Neither eternalism nor standard presentism captures both all of the tenets of Special Relativity and our observation that the universe is dynamic. A three-dimensional universe of dynamic, space-like separated particles captures both. Although three-dimensionalism contemplates no spatially extended present, it is not solipsism because the things we see on our past light cones endure in some form. The ontology of a dynamic, three-dimensional universe allows us to quantify the rate at which time elapses as a function of the rate at which photons recede in vacuo. It is shown that intuitive ideas related to elapse of time that are argued by others to be philosophical dead ends in an eternalist block universe find ready explanation in a dynamic, three-dimensional universe.