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The relative precision of the constellations, the path of the Milky Way, and information on the parallels and colures is therefore even more remarkable.
The four crossbars, or rungs of the ladder, are the four colures , which come together at the pole.
Two great circles, the solstitial colure and the equinoctial colure, intersect at the celestial poles.
Thus after seventy-two years the colure of the vernal equinox which passed through a fixed star, corresponds with another fixed star.
The equinoctial colure is a great circle which passes through the celestial poles and the ecliptic at the two equinoxes.
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