How Do We Know Time Has Passed?

Imagine you're playing a game, and you look at the clock, it's 12 o'clock. You go to bed and wake up the next day, and now it's 1 o'clock. That’s how we know time has passed. But what if there was no clock? What if you were just counting your breaths or your steps? We use things like our memory, changes in our body, and even things like the sun moving across the sky to tell time has gone by, sometimes without even noticing.

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Examples

  1. When time passing makes you feel tired at the end of the day, even if there was no clock.
  2. You see your dog running around in the park, that’s a sign time has passed, because earlier he was resting.
  3. If it's sunny now and dark later, then time has passed.

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