High Quality Content by WIKIPEDIA articles! A time scale specifies divisions (scale) of time and possibly an epoch that marks the time when the time scale began ("time zero"). * A time standard is a specification of either the rate at which time passes, or points in time, or both. * A duration is a quantity of time. * The geological time scale divides up the history of Earth into scientifically meaningful periods. In cosmology and particle physics: * The Planck time is the time scale beneath which quantum effects are comparable in significance to gravitational effects. Neither general relativity nor quantum field theory adequately describe physics at the Planck time scale.

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