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"It is utterly beyond our power to measure the changes of things by time.Quite the contrary, time is an abstraction at which we arrive through thechanges of things." Ernst Mach [1].  What change? Three answers to this are `any change' (Rovelli), 'all change'(Barbour) and my argument here for the middle ground of a `sufficient totalityof locally relevant change' (STLRC) giving a generalization of the astronomers'ephemeris time. I then use STLRC as a selection principle on existing and newapproaches to the Problem of Time in Quantum Gravity. EmergentJacobi-Barbour-Bertotti time can be interpreted as arising from a STLRC,resolves the classical Problem of Time and has an emergent semiclassicalcounterpart as regards facing the QM Problem of Time.

Machian Time Is To Be Abstracted From What Change?