Duad, Dwadasama, Dwadachamsha
Definition of Duad:
A twelve-fold subdivision of the signs (each composed of 2 1/2°) developed by Hindu astrologers. The first duad of each sign is sub-ruled by the natural planetary ruler of the sign; the second duad is sub-ruled by the ruler of next sign in the zodiac and so on. These “signs within a sign,” by virtue of their planetary rulers, account for subtle shadings of expression found in different degrees of the same sign.
