colure

For some reason, the equator, the colure, the zenith and the poles were all marked out by these serpentine or draconic forms.

The western star, in the head of Andromeda, lies in the equinoctial colure.

The solstitial colure is the meridian which passes through the solstitial points.

The equinoctial colure is the meridian which passes through the equinoctial points.

Note the star μ, which serves to point out the Winter Solstice, where the solstitial colure intersects the ecliptic.