🚀 How Long Does It Take to Fly to Mars? Hohmann Transfer, Launch Windows and Porkchop Plot Lab

Interactive 3D inner solar system: pick a launch date and a departure burn from low Earth orbit and see whether a generic spacecraft meets Mars (Hohmann transfer about 259 days, windows every 26 months, delta-v about 3.6 km/s). A Lambert-solver porkchop plot shows C3 and delta-v for every launch and arrival date, the rocket equation shows what a faster trip costs in fuel, plus radio delay (3-22 min) and a radiation-dose estimate. Closed-form checks against the numerical solver; approximate public figures.