The only tangible empirical evidence of ‘Time passing’ is change. Time references change in two core contexts:-
- The dimension of change. Time calibrates and indexes change and events in standard units. Hence rate i.e. miles per hour. The per hour bit is the calibration of change rate.
- The collective ‘flow’ of change events. Time is to change-events what traffic is to vehicles….a non-specific collective term. Does Traffic actually exist? Fundamentally all that exists are individual vehicles. Does Time actually exist..fundamentally all that exists are quantum change-events.
So Time references change in two contexts…both are abstract. So the nature of Time is that it is abstract. The tangible reality is change and change-events.
(Though try telling a taxi driver late for the airport that fundamentally neither Traffic nor Time actually exist)