World time

from Wikipedia, the free encyclopedia

The world time , also called earth time or universal time , is a world-wide usable time system with which the same time is displayed on all places on earth. When using it, there is no (possibly incorrect) conversion of event times that interest the entire population of the world into the respective zone time . The i. d. Generally used world time is the zone time related to the longitude of Greenwich ( Greenwich Mean Time GMT , from 1972 Coordinated Universal Time UTC ).


The earliest representative of a world time - connected with the hour counting from 1 to 24 - was Sandford Fleming . He was of the opinion that “an enlightened world citizenship would ultimately need nothing more than a unified universal day” with world time. He was one of the initiators of the Washington Meridian Conference , which took place in 1884 , at which a reference meridian suitable for universal time was recommended with the meridian through Greenwich . The immediate and more important consequence of this recommendation, however, was the creation of 24 time zones , which ended the use of the many regional time systems that were not in a uniformly ordered relationship ( solar times in regional main locations). The use of a universal time such as that in mind for Fleming began only later, especially with the rapid global air traffic . As such, Greenwich Mean Time (GMT), which has been practically possible since 1884 and related to the meridian through Greenwich, finally established itself .

The GMT is the mean solar time determined by astronomical measurements on the meridian leading through the Greenwich Observatory . In 1928 it was renamed Universal Time (UT). Since 1972, the Coordinated Universal Time (UTC) realized by atomic clocks has been used as universal time .

1884-1924 GMT (Greenwich Mean Time)
1925-1928 new GMT
1928-1971 UT (Universal Time)
since 1972 UTC (Coordinated Universal Time)

See also

Web links

Wiktionary: World time  - explanations of meanings, word origins, synonyms, translations

Individual evidence

  1. It's a matter of seconds. TAZ , October 25, 2003
  2. Messen: Zeit - Seite bei Beyenbach ; As of October 4, 2011
  3. ^ Meyer's Large Conversational Lexicon . 6th edition. Bibliographisches Institut, Leipzig / Vienna 1909 ( [accessed on September 30, 2019] lexicon entry “World Time”).
  4. Clark Blaise : The Taming of Time: Sir Sandford Fleming and the Invention of Universal Time . Frankfurt a. M .: S. Fischer, 2001. ISBN 3-10-007109-3 . P. 236