Astrological sign of a sign are together sufficient to define it, they can be grouped to indicate their symbolism. The first four signs, Aries, Taurus, Gemini and Cancer, form the group of personal signs. The next four signs, Leo, Virgo, Libra and Scorpio form the group of interpersonal signs. The last four signs of the zodiac, Sagittarius, Capricorn, Aquarius and Pisces, form the group of transpersonal signs. Dane Rudhyar presented the tropical zodiac primary factors, used in the curriculum of the RASA School of Astrology. The tropical zodiac is the zodiac of seasonal factors as opposed to the sidereal zodiac (constellation factors).
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