Excerpts from Time
Excerpts from Time

Common Time

Events are measured in units of time based on mutually defined scales and standards.

Commonly defined time standards are derived from astronomical cycles, atomic frequencies, and geospheric cycles, and include Earth Time, Coordinated Universal Time, Standard Time, geophysical time, biological time, evolutionary time, psychological time, social and cultural time, historical time, time and distance, and system control time.

General Definitions

Time is the rate at which change occurs in the universe.

Time is incremental, continuous, and unidirectional.

Time is the absolute rate at which a change occurs, and refers to the observed rates of change of one event in relation to another event.

The time rate of change of an event or events is expressed as a length, a direction, an order, an interval, a relation, a unit, and a comparison.