Gravitational Microlensing: Light Curve Simulator

When an unseen foreground star drifts almost directly between Earth and a distant background star, its gravity briefly bends and focuses that star's light, splitting one image into two and brightening the whole system for days to weeks before fading back to normal. This simulator renders the real 3D geometry of that alignment — the lens star, the moving source, its two lensed images straddling the Einstein ring — while plotting the exact Paczyński light curve the event produces, driven by the same impact parameter, Einstein crossing time and finite source size that astronomers fit to real microlensing surveys like OGLE and MOA.