Orbital Maneuvers 2D: Prograde/Retrograde Burns & Hohmann Transfer

Real orbital mechanics is not about drawing pretty ellipses — it is about deciding when and how hard to burn. This 2D companion strips the problem down to its two-body core: one spacecraft, one central mass, and a fixed-step RK4 integrator that lets you fire prograde or retrograde impulses and watch the vis-viva equation reshape the orbit's energy, semi-major axis and eccentricity in real time. Dial in a target radius and the Hohmann-transfer button computes both burns analytically — departure and circularization — fires them at the right moments, and reports the total delta-v and transfer time a real mission planner would need.