Time scale

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:
 * Orders of magnitude (time) as a power of 10 in seconds;
 * A specific unit 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

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), which divides music into sections of time

In project management:
 * Man-hour, the time scale used in project management to account for human labor planned or utilized