Colur
Colur or Kolur from ancient Greek κόλουρος "cut off", is the now outdated name for two specific great circles on the celestial sphere , which run through the celestial poles , comparable to the longitudes of the earth. Sometimes the corresponding four meridians were also understood as colures. The term is supposed to go back to the fact that the circles are not completely visible through rotation like the other celestial circles, but appear "cut off" by the horizon.
- The equinox
- runs from the poles through the point of spring and autumn - the intersection of the celestial equator with the ecliptic , or equinoxes ( equinoxes ).
- The solstitial color
- or Zaphea runs at right angles to it from the poles through the points of the solstices (solstices).
Individual evidence
- ↑ Reinhard Glasemann: Earth, Sun, Moon & Stars. In: Writings of the Historical Museum. Frankfurt / M. 1999, No. 20; ISBN 3-7829-0504-0
- ^ Zeno: Koluren in Herders Conversations-Lexikon 1st edition 1854-1857
- ↑ Real Encyclopedia of Classical Antiquity Studies in alphabetical order. Published by August Pauly. Metzler, Stuttgart 1842, vol. 2, p. 520 “Colūrus”. Full text in Google Book Search