Kykloi

Kykloi ( ancient Greek κύκλοι , Latin cycli ) were the eleven celestial circles in ancient astronomy. These were counted:

• the Milky Way as the only visible celestial circle,
• the celestial equator ,
• the northern and southern tropics running parallel to the celestial equator ,
• the northern and southern polar circles , which also run parallel ,
• the ecliptic ,
• the two colurs , the equinox and the solstitial colour, and
• Horizon and meridian .

With the exception of the tropic and polar circles , all are great circles . All circles are firmly positioned on the celestial sphere and are therefore called immovable ( ἀκίνητοι immoti ), except for the horizon and meridian, which are therefore called movable ( κινούμενοι volucres ).

swell

• Achilleus Tatios introductio in Aratum 22-27
• Aratos by Soloi Phainomena 469-558
• Eudoxos from Knidos fr. 62-69
• Geminos of Rhodes Eisagoge eis ta phainomena 5
• Hyginus Mythographus De astronomia 4.1-10
• Marcus Manilius astronomica 1.561-804

literature

• Wolfgang Huebner : Kykloi. In: The New Pauly (DNP). Volume 6, Metzler, Stuttgart 1999, ISBN 3-476-01476-2 , Sp. 961.