Orbital Slingshot Maneuver (2D)

This 2D companion runs the same moving-planet gravity-assist encounter as the 3D version on a flat top-down canvas: a side panel exposes planet mass, entry speed, lateral drift and orbital phase, a live readout tracks current speed, speed gain, closest flyby distance, mission time, live distance and deflection angle, and a distance-vs-time trace makes the exact moment of closest approach — and how sharply it bends the trajectory — directly visible instead of hidden inside a free-orbiting 3D camera.