Encyclopedia > Period

  Article Content


A period is an arbitrary interval of time. The word is applied to many different concepts:

Further meanings less connected with time:

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article
Solar time

... varies because of the 23.5º tilt of the Earth's axis. (see Tropical year) Mean solar time is based on a fictional mean sun which travels at a constant rate ...