year

year, time required for the earth to complete one orbit about the sun. The solar or tropical year is measured relative to the sun and is equal to 365 days, 5 hr, 48 min, 46 sec of mean solar time (see solar time). The sidereal year, measured relative to the stars, is longer than the tropical year by about 20 min. The calendar year is used for practical purposes and always contains a whole number of days, the ordinary year being 365 days and the leap year 366 days.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

More on year from Fact Monster:

  • Year by Year: 1900-2008 - Infoplease Year by Year Page
  • sidereal year - sidereal year sidereal year, time required for the earth to complete an orbit of the sun relative ...
  • School Years around the World - School Years around the World from Australia to Asia.|From Australia to South Korea
  • The Gap Year - A growing trend among American students
  • Year in Review, 2007 - An overview of national and international events, people in the news, timelines, and quizzes|Top events for the nation and the world

See more Encyclopedia articles on: Astronomy: General