User Inputs
X-Initial Y-Initial
Vx-Initial Vy-Initial
Orbit Time Time Step
We place two equally massive "stars" at the (x,y) points (-1,0) and (+1,0). We then specify the initital position and velocity components of a mobile, orbiting "planet." Since the initial velocity is constrained to the plane defined by the stars and the initial planet position, the subsequent motion remains in the plane. We stipulate that the stars (somehow) remain fixed at their positions.