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OF PLANETS’ POSITIONS
The initial point or reference point of the zodiac is fundamental for obtaining positions of the heavenly bodies. For measuring celestial longitude in the tropical system, the vernal equinoctial point, which is one of the intersection points of the ecliptic and the equator has been taken as the initial point. This initial point in the tropical system does not occupy any fixed position among the stars, it always moves back ward in the western direction in the starry heavens due to precession of the equinoxes with an annual motion of about 50.3” completing the circle in about 26000years. The longitudes measured in this system is called the Tropical or Sayana longitude. In the Sidereal or Nirayana system the reference circle is the ecliptic.