Solar Sail Thrust & Orbit Steering (2D)

Sunlight has no mass, but it carries momentum, and a large enough mirror can ride that momentum like a ship rides the wind. This top-down 2D simulator computes the exact same radiation-pressure force vector as the real physics — absorption plus specular reflection, scaled by cone angle and reflectivity — but goes further than a static force diagram: it integrates that force together with solar gravity as the spacecraft actually orbits the Sun, using a fixed cone-steering law recomputed every step from the current sun-line. Tilt the cone angle positive to watch the orbit spiral outward as the sail pumps energy in, or negative to watch it spiral inward, and track the semi-major axis readout — the only reliable sign of whether the orbit is really growing or shrinking as distance oscillates around each new ellipse.