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| celestial equator |
a great circle, corresponding to the earth's equator, on the celestial sphere. |
| celestial pole |
either of two points in the celestial sphere that the earth's axis would intersect if it were extended. |
| circumpolar |
moving around or close to one of the poles of the earth or of 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 similar circle that passes through the poles of the celestial sphere. [1/7 definitions] |
| North Pole |
the point on the celestial sphere that is intersected by a northward extension of the earth's axis. [1/4 definitions] |
| planisphere |
a projection on a plane of the celestial sphere, with a movable overlay showing which stars are visible at a particular place and time. [1/2 definitions] |
| South Pole |
the point on the celestial sphere that is intersected by a southward extension of the earth's axis. [1/4 definitions] |
| vertical circle |
an imaginary circle on the celestial sphere that passes through the zenith and nadir and is thus perpendicular to the horizon. |
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