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The present page holds the title of a primary topic, and an article needs to be written about it. It is believed to qualify as a broad-concept article. It may be written directly at this page or drafted elsewhere and then moved to this title. Related titles should be described in Time scale, while unrelated titles should be moved to Time scale (disambiguation).

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

• Disambiguation pages
• Time scales