FIG. 11.

Constructing orbit transfers. (a) We take two arbitrary points labeled A and B and construct the incoming and outgoing solution trajectories from each, using two values C = 0 and C = 0.7. There must be a crossing point, which we label point O. The two segments AO followed by OB is the two-switch trajectory that takes us from A to B. (b) Shown is the curvilinear grid constructed by families of solution curves for the three values C = 0, C = 0.3, C = 0.7. Any point of intersection can be used as a starting point and an ending point to construct a three-switch orbit.