Search this site:

Encyclopedia: ecliptic


Reference


Word of the Day
competent
Definition: (adjective) having the skill and knowledge needed for a particular task; capable
Petersons.com
Add Word of the Day to your personalized My Yahoo! page:
Add to My Yahoo! View RSS Feed
About My Yahoo! and RSS »

 
Columbia University Press
ecliptic
 (ēklĭp´tĭk, ĭ—) , the great circle on the celestial sphere that lies in the plane of the earth's orbit (called the plane of the ecliptic). Because of the earth's yearly revolution around the sun, the sun appears to move in an annual journey through the heavens with the ecliptic as its path. The ecliptic is the principal axis in the ecliptic coordinate system. The two points at which the ecliptic crosses the celestial equator are the equinoxes. The obliquity of the ecliptic is the inclination of the plane of the ecliptic to the plane of the celestial equator, an angle of about 231⁄2°. The constellations through which the ecliptic passes are the constellations of the zodiac.


Search Encyclopedia:

 More on Yahoo! Education
 • Online and On-Campus Degree Programs
    MBAs  -  Technology Management  -  Education  -  Health  -  More

 • College & Grad School - A Comprehensive Guide
    College Search  -  Test Prep  -  Application Tips  -  Scholarship Search

The Columbia Encyclopedia, Sixth Edition. Copyright © 2006 Columbia University Press
-