Definition:Western Celestial Hemisphere

Definition
Consider the celestial sphere $C$ with observer $O$.

Let $W$ be the west point of the horizon.

The western celestial hemisphere is the hemisphere of $C$ defined by the principal vertical circle which contains $W$.


 * Celestial-Sphere.png

Also see

 * Definition:Eastern Celestial Hemisphere


 * Definition:Northern Celestial Hemisphere
 * Definition:Southern Celestial Hemisphere