Astrology originated in Mesopotamia (c. 3rd millennium BC) and spread to
India, but it developed its Western form in Greek civilization during
the Hellenistic period.
Astrology entered Islamic culture as part of the Greek tradition and was
returned to European culture through Arabic learning during the Middle
Ages.
According to the Greek tradition, the heavens are divided according to
the 12 constellations of the zodiac, and the bright stars that rise at
intervals cast a spiritual influence over human affairs.
Astrology was also important in ancient China, and in imperial times it
became standard practice to have a horoscope cast for each newborn child
and at all decisive junctures of life.
Though the Copernican system shattered the geocentric worldview that
astrology requires, interest in astrology has continued into modern
times and astrological signs are still widely believed to influence
personality.