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Time scale may refer to:
- Time standard, a specification of either the rate at which time passes, points in time, or both
- A duration or quantity of time:
- Geological time scale, a scale that divides up the history of Earth into scientifically meaningful periods
In astronomy and physics:
- Dynamical time scale, in stellar physics, the time in which changes in one part of a body can be communicated to the rest of that body, or in celestial mechanics, a realization of a time-like argument based on a dynamical theory
- Nuclear timescale, an estimate of the lifetime of a star based solely on its rate of fuel consumption
- Thermal time scale, an estimate of the lifetime of a star once the fuel reserves at its center are used up
In cosmology and particle physics:
- Planck time, the time scale beneath which quantum effects are comparable in significance to gravitational effects
- Time-scale calculus, the unification of the theory of difference equations with differential equations
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