equator you live, the greater the difference. Signs are known as of "long" or "short" ascension. [ 19 ]  Precession of the equinoxes Further information: Precession of the equinoxes ,  Epoch (astronomy) ,  Sidereal astrology ,  Tropical astrology ,  Astrological age , and  Ayanamsa  The zodiac system was developed in Babylonia , some 2,500 years