How this works
The engine converts the entered local time to UTC, computes Moon longitude, subtracts Lahiri ayanamsa and divides the zodiac into twelve 30-degree signs.
Approximate geocentric Sun/Moon calculations using the existing Meeus-based engine and a linear Lahiri ayanamsa. Near sign/Nakshatra boundaries, verify with a precise ephemeris. This is not a full Kundli.