reverse search

Comprehensive
Dictionary Suite
Help
Help
Help
 
celestial equator a great circle, corresponding to the earth's equator, on the celestial sphere.
colure either of the two great circles of the celestial sphere that intersect at the poles, one passing through the solstices and the other through the equinoxes.
meridian a great circle circumscribing the earth and passing through both poles, or either half of such a circle from one pole to the other. [1/7 definitions]