The Zodiac Crimes Robin deduce that he is plotting to commit twelve crimes based loosely on astrological signs of the zodiac and that he committed the first Zodiac Crime already by stealing the rare art map, whose initials stand for the sign of the Ram (Aries). Meanwhile, back at his hideout Joker clues the recently arrived (rather, packaged and shipped) Penguin into his astrological plan. He then gives a false clue to Batman and Robin to the effect that "Taurus the Bull is next on my show", and "You'll be singing a song of woe!" Batman and Robin deduce that Joker was telling
Zodiac late Antiquity, by which time Ptolemy's influence was widely established. Ptolemy clearly explained the theoretical basis of the western zodiac as being a tropical coordinate system, by which the zodiac is aligned to the equinoxes and solstices, rather than the visible constellations that bear the same names as the zodiac signs. The Hindu zodiac uses the sidereal coordinate system, which makes reference to the fixed stars. The Tropical zodiac (of Mesopotamian origin) is divided by the intersections of the ecliptic and equator, which shifts in relation to the backdrop of fixed stars at a rate of 1° every 72 years,