How do we know time exists and isn’t just an imaginary measurement?
In: Physics
If you’re talking specifically for physics, then “time”, as in a direction of development, is an equivalence to both causality and to the limited (non-infinite) speed of light. Because information can only travel at a fixed speed, and we observe that things do in fact travel, this necessitates that events have an “order” (although that order itself is subjective).
We can then use thermodynamics to define the positive direction of time to be the direction of increasing entropy, which we use because that also coincides with how we mentally interpret time.
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