I know it's an Astrology site.
(Don't forget even Johannes Kepler cast Horoscopes for Rudlolph 2 of Prague! Different days. )
See:
cura.free.fr/xv/11ellis1.html
Quote from the site, about astronomy:
"The concept that the Greeks borrowed from the Celts, found a leading advocate in the Athenian-born scholar Clement of Alexandria (c. AD 150 - AD 211/216). " 
