Astrology and mythology are interconnected as Mythology offers a background story to Astrology.
Astrological terminology has its roots in Greek and Roman Mythology, all astrological constellations have Mythological names.
Astrologers use all Zodiac constellations except Ophiuchus. The so-called 13th sign, was not adopted into Astrology because the sun barely passes through this constellation during its path through the Zodiac.