OK, I made up the name "time as a wavefront" and I don't know that it really fits. But I had this thought recently and I wonder whether/where/how it fits into modern physics theory. An inertial body in motion through the three spacial dimensions retains it's motion. Consider all of the universe as in constant velocity motion along the fourth dimensional time axis. Consider that time has no "length" in its direction of travel, so "the present" exists as a "wavefront". This seems to have some general alignment with micro and macro visions of physics. The movements of massive bodies are predictable due to a high "time momentum". The actions of quantum particles are unpredictable due to near zero "time momentum". Obviously, this is not a complete or even well considered theory. Just some vague thoughts that probably aren't even self-consistent. Is anything about this familiar to anyone?