Transfer in minimum time
Space Trajectories. Low Thrust Orbital Transfer

We place ourselves in a geocentric inertial frame of reference (OXYZ) called ECI (Earth Centered Inertial) whose X and Z axes point respectively to the vernal point V and the North Pole. The Sun's relative motion around the Earth is a circular orbit in the ecliptic plane, with an inclination (or obliquity) of i_s = 23.45° to the equator, intersecting along OX (figure 1). The Sun's α_s anomaly is measured from the X axis. The values α_s = 0, 90, 180 and 270° correspond respectively to the spring equinox, summer solstice, autumn equinox and winter solstice for...