A **time scale** specifies divisions of time.

- Time standard, a specification of either the rate at which time passes, or points in time, or both
- Duration (disambiguation), a quantity of time

- Geological time scale, a scale that divides up the history of Earth into scientifically meaningful periods

- In astronomy and astrophysics:
- Dynamical time scale
*either*(in stellar physics) measures the length of time over which changes in one part of a body can be communicated to the rest of that body,*or*(in celestial mechanics) is a realization of a time-like argument based on a dynamical theory - Nuclear time scale, estimates the lifetime of a star based solely on its rate of fuel consumption
- Thermal time scale, estimates the lifetime of a star once its fuel reserves at its center are used up or if they were to disappear

- Dynamical time scale

- In cosmology and particle physics:
- Planck time, the time scale beneath which quantum effects are comparable in significance to gravitational effects

- In mathematics:
- Time scale calculus, the unification of the theory of difference equations with differential equations

- In music:
- rhythm, a temporal pattern of events
- Time scale (music), divides up music into sections based on the scope

### Famous quotes containing the words time and/or scale:

“All neighbourly content and easy talk are gone,

But there’s no good complaining, for money’s rant is on,

He that’s mounting up must on his neighbour mount

And we and all the Muses are things of no account.

They have schooling of their own but I pass their schooling by,

What can they know that we know that know the *time* to die?”

—William Butler Yeats (1865–1939)

“There is something in us, somehow, that, in the most degraded condition, we snatch at a chance to deceive ourselves into a fancied superiority to others, whom we suppose lower in the *scale* than ourselves.”

—Herman Melville (1819–1891)

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