- Two great circles, the solstitial colure and the equinoctial colure, intersect at the celestial poles.
- The four crossbars, or rungs of the ladder, are the four colures, which come together at the pole.
- The relative precision of the constellations, the path of the Milky Way, and information on the parallels and colures is therefore even more remarkable.
Late Middle English: from late Latin coluri (plural), from Greek kolourai (grammai) 'truncated (lines)', from kolouros 'truncated', so named because the lower part is permanently cut off from view.
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