This system was brought into Hellenistic Egypt from Mesopotamia, where astrology had been practiced for millenniums and where seven had always been a propitious number.

• 这个体制从美索不达米亚引进到具有古希腊文明的埃及，在美索不达米亚，星象术已流行了上百万年，七一直是个吉利的数字。