Measuring time at all depends on the fact that:

Question

Accepted Answer

D. Something must change

1. Time is registered by counting repetitions of some process.
2. It is impossible to know that time has passed unless something changes.
3. A pendulum can measure time by counting its swings.
4. Connecting that pendulum to a clock mechanism registers the count on a dial.
5. Any repeatable change will do, which is why so many different clocks exist.
_Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 2 'Kinematics', sections 2.1-2.8_

Answer

Clocks must be electric

Answer

Motion must be uniform

Answer

Distances must be known

Measuring time at all depends on the fact that:

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