time
The point in time is a precisely determined moment in a time frame of reference . It can be specified on a time scale and - in contrast to the time span - has no extension.
- A point in time is a formal, mathematical-physical model that can be used to describe a certain time with a number . It serves to represent simultaneity: Similar to the mathematical model of a point in space , a point in time has a duration of zero and thus no expansion in the dimension of time.
- In physics, one can only speak of “exact times” to a limited extent, since the known physical laws beyond the Planck time (approx. 10 −43 s ) fail. Time then means:
- A measure of time that is sufficiently precise with regard to the accuracy of the calculation.
- This makes the point in time a scale-dependent term. For example, if the second for the development of the solar system is unnecessarily short, it is a uselessly long period of time in relation to the switching speed of a microprocessor (see also: simultaneous measurement ).
- In connection with network planning and scheduling , a point in time according to DIN 69900 Part 1 is a defined point in the process, the position of which is described by time units (e.g. minutes, days, weeks) and is related to a zero point. The term is then synonymous with the word “ appointment ”.
literature
- Christian W. Thomsen, Hans Holländer: moment and time. Scientific Book Society, Darmstadt 1984.
- Irmgard Sonnen: A diary for 365 points in time. With scientific, philosophical and literary texts about point in time, moment, second, period, time measurement, etc., Düsseldorf 2004.
Web links
Wiktionary: point in time - explanations of meanings, word origins, synonyms, translations
swell
- ↑ DIN 69900 Part 1, 1987: Network plan technology terms