Sidereal Zodiac Converter
Convert Tropical positions to Sidereal using a selected Ayanamsha.
Note: Predefined Ayanamsha values are approximate for the current epoch (c. 2024/2025). For precise historical calculations, use specific Ayanamsha values for the target date.
About Ayanamsha:
Ayanamsha is the Sanskrit term for the longitudinal difference between the Tropical (Sayana) and Sidereal (Nirayana) zodiacs. Due to the precession of the equinoxes, the starting point of the Tropical zodiac (0° Aries) slowly shifts backward against the background of fixed stars. The Ayanamsha value quantifies this shift for a given date or epoch.
Different astrological traditions use slightly different Ayanamsha values, leading to variations in Sidereal chart calculations.