This satellite orbits the selected central body. Beta is the angle between the sunlight direction and the orbital plane. Cyan marks the sunlit part of the orbit; magenta marks eclipse. The shaded sector shows eclipse phases, not the physical shape of the shadow. The model assumes a circular orbit and a cylindrical shadow, and excludes eclipses caused by other bodies. Sizes and distances are schematic. Playback takes 12 seconds per orbit for comparison; the calculated orbital period is shown above.