**Coordinate Time**

In the theory of relativity, it is convenient to express results in terms of a spacetime coordinate system relative to an implied observer. In many (but not all) coordinate systems, an event is specified by one time coordinate and three spatial coordinates. The time specified by the time coordinate is referred to as **coordinate time** to distinguish it from proper time.

In the special case of an inertial observer in special relativity, by convention the coordinate time at an event is the same as the proper time measured by a clock that is at the same location as the event, that is stationary relative to the observer and that has been synchronised to the observer's clock using the Einstein synchronisation convention.

Read more about Coordinate Time: Coordinate Time, Proper Time, and Clock Synchronization, Mathematics, Measurement, Coordinate Time Scales

### Other articles related to "coordinate time, time":

**Coordinate Time**

... So far the geodesic equation of motion has been written in terms of proper

**time**, s ... It can also be written in terms of the

**time**coordinate ...

... Indeed, the thermal

**time**scale assumes that there is no fuel at all inside the star and simply predicts the length of

**time**it would take for the resulting change in ... As an example, the Sun's thermal

**time**scale is approximately 30 million years ...

**Time**measurement and standards Major subjects

**Time**Chronometry Orders of magnitude Metrology International standards UTC UTC offset UT ΔT DUT1 IERS ISO 31-1 ISO 8601 TAI 12-hour clock 24-hour clock ...

**Coordinate Time**Scales

... A

**coordinate time**scale (or

**coordinate time**standard) is a

**time**standard designed for use as the

**time**coordinate in calculations that need to take account of relativistic effects ... The choice of a

**time**coordinate implies the choice of an entire frame of reference ... As described above, a

**time**coordinate can to a limited extent be illustrated by the proper

**time**of a clock that is notionally infinitely far away from the objects of interest ...

... Introduce two temporal variables A

**coordinate time**in the sense of Einstein An invariant evolution parameter in the sense of Newton Hypothesis I led to a relativistic ...

**Time**in the relativistic probability conservation equation is Einstein’s

**time**and is a consequence of implicitly adopting Hypothesis I ... the second law of thermodynamics establishes an “arrow of

**time**” for evolving systems, including relativistic systems ...

... metadata ISO/IEC 11179 Representation term ISO 8601

**Time**measurement and standards Major subjects

**Time**Chronometry Orders of magnitude Metrology International standards UTC UTC offset UT ΔT ...

### Famous quotes containing the word time:

“Frequently also some fair-weather finery ripped off a vessel by a storm near the coast was nailed up against an outhouse. I saw fastened to a shed near the lighthouse a long new sign with the words “ANGLO SAXON” on it in large gilt letters, as if it were a useless part which the ship could afford to lose, or which the sailors had discharged at the same *time* with the pilot. But it interested somewhat as if it had been a part of the Argo, clipped off in passing through the Symplegades.”

—Henry David Thoreau (1817–1862)