Explore the lunar phase and approximate illuminated fraction for an entered instant.
How this works
Phase uses the Sun–Moon longitude difference. Illumination uses (1 − cos(angle)) / 2, a simplified geocentric approximation; it is not local moonrise or an observance-time decision.
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.