Zodiac of the tribes around the Tabernacle (reported in the Book of Numbers) corresponded to the order of the Zodiac, with Judah, Reuben, Ephraim, and Dan representing the middle signs of Leo, Aquarius, Taurus, and Scorpio, respectively. Such connections were taken up by Thomas Mann, who in his novel "Joseph and His Brothers" attributes characteristics of a sign of the zodiac to each tribe in his rendition of the Blessing of Jacob. The Babylonian star catalogs entered Greek astronomy in the 4th century BC, via Eudoxus of Cnidus. Babylonia or Chaldea in the Hellenistic world came to be so identified with
Zodiac tropical zodiac used in Western astronomy and astrology, this means that the tropical "sign" of Aries currently lies somewhere within the "constellation" Pisces ("Age of Pisces"). The sidereal coordinate system takes into account the ayanamsa, "ayan" meaning "transit" or "movement", and "amsa" meaning "small part", i.e. movement of equinoxes in small parts. It is unclear when Indians became aware of the precession of the equinoxes, but Bhaskar II's 12th-century treatise "Siddhanta Shiromani" gives equations for measurement of precession of equinoxes, and says his equations are based on some lost equations of "Suryasiddhanta" plus the equation of Munjaala. The discovery of