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Tropical Vs Sidereal was the question in the live QA session and this was the technique that will clear all doubts regarding ayanamsa as well as the debate over Tropical and sidereal zodiac.
Sidereal and tropical are astrological terms used to describe two different definitions of a year. They are also used as terms for two systems of ecliptic coordinates used in astrology. Both divide the ecliptic into a number of "signs" named after constellations, but while the sidereal system defines the signs based on the fixed stars, the tropical system defines it based on the position of vernal equinox in the northern hemisphere (i.e., the intersection of the ecliptic with the celestial equator). Because of the precession of the equinoxes, the two systems do not remain fixed relative to each other but drift apart by about 1.4 arc degrees per century. The tropical system was adopted during the Hellenistic period and remains prevalent in Western astrology. A sidereal system is adopted in Hindu astrology, and in some 20th century systems of Western astrology.
While classical tropical astrology is based on the orientation of the Earth relative to the Sun and planets of the Solar System, sidereal astrology deals with the position of the Earth relative to both of these as well as the stars of the celestial sphere. The actual positions of certain fixed stars as well as their constellations is an additional consideration in the horoscope.
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