There are two words in ancient Greek for time.
One is kairos
, a personal time, an opportune moment. The other is chronos
, the time of clocks and the outer world. We are all familiar with the feeling of shifting time, when we focus on an interesting problem. In GR time also shifts, but with the gravitational field. Dirac
thought about two kinds of time, an atomic and a celestial. The philosopher Hegel
developed a theory of the world in which the world's consciousness develops through the history of ideas, which defines a timeline for the world.
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