4 ms·
If you need time elapsed then you implicitly need a frame of reference in the same way that a clock time needs a time zone to be meaningful in a global basis.
by dasil003 5y ago
If you need time elapsed then you implicitly need a frame of reference in the same way that a clock time needs a time zone to be meaningful in a global basis. In practice if you wanted this it would mean having a timer colocated within your frame of reference as there is no scalar representation of a frame of reference that would allow you to do timestamp calculations. Timestamp math only works as a hack because we mostly stay relativistically close to Greenwich.
- fanf2 5y agoAstronomers use mathematical models of the solar system to translate between barycentric time, geocentric time, and terrestrial time, which are all different relativistic frames of reference. Only TT has actual clocks: TAI ticks at the same rate as TT, tho for historical reasons there is a fixed offset. That isn’t counting the clocks derided from observing the orbits of the moons and planets…