Time in physics - Wikipedia
https://en.wikipedia.org/wiki/Time_in_physics
OverviewMarkers of timeThe unit of measurement of time: the secondConceptions of timeDynamical systemsSignallingTechnology for timekeeping standardsTime in cosmologyIn physics, time is defined by its measurement: time is what a clock reads. In classical, non-relativistic physics, it is a scalar quantity (often denoted by the symbol ) and, like length, mass, and charge, is usually described as a fundamental quantity. Time can be combined mathematically with other physical quantities to derive other concepts such as motion, kinetic energy and time-dependent fields.
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