Abstract: Everything that happens, happens over a period of time, and never at an instant. Time must have a topology, but it only has a metric if there are laws of nature. The future is what we can causally affect; the past is what causally affects us (and so neither backward nor simultaneous causation are possible). There are both indexical and non-indexical temporal facts (the A-series of events is not reducible to the B-series.) Necessarily, time has no beginning and no end.

Keywords: A-series, B-series, backward causation, causation, eternity, metric, temporal fact, time, topology,