Ayanamsa
Zodiac frame
The ayanamsa is the angle between the tropical zodiac and a sidereal one: how far the equinox point has drifted from the stars. Subtract it from a tropical position and you have the position against the constellations. This app uses the Chimenti ayanamsa, a little over 31 degrees today and growing slowly with precession, which moves a chart just under six gates from where a tropical calculation puts it.
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