AstroSutra combines astronomical calculations with selected Vedic chart conventions. Birth date, time, and location determine the starting moment. Swiss Ephemeris supplies planetary positions, and Lahiri ayanamsa places them in a sidereal chart. Software then derives chart factors and Vimshottari Dasha periods using defined rules. Their astrological meaning is interpreted through traditional frameworks; neither calculation precision nor software tests make a future outcome certain.
Read the accuracy and provenance guide or use the free Moon Sign Calculator to see an accessible calculation.