Every motion in space is also a motion in time.

The speed of light is the upper limit of the spacetime rate.

— Me@2012-04-28 12:42:08 PM

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An object cannot change this position without changing its time coordinate.

In short, there is no instantaneous motion.

— Me@2020-08-12 05:26:20 PM

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2020.08.12 Wednesday (c) All rights reserved by ACHK