Atmakaraka (or Atma Karaka) is calculated using the sidereal zodiac. You can learn more about this important astrological factor from my article Atmakaraka, the Ruler of the Soul
The result of Atmakaraka calculation will depend on which Ayanamsa (or the difference between tropical and sidereal zodiacs) is used. In this calculator, the Lahiri Ayanamsa is used.
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