Occult Philosophy

"The elders had also a representation of the head and tail of the Moon, which had the effigy of a serpent with the head of a sparrow hawk, placed between two circles, one representing air and the other, fire. 
And surrounding these two circles in the likeness of the Greek letter theta, they made this image when Jupiter and the head of it, occupied the centre of the heavens, and they believed that it aided a lot to do make requests succeed... "

Occult philosophy (Chapter XIV), 1727.