| The line of apsides is a line which passes through both periapsis, Cassini's closest approach to Saturn in an orbit, and apoapsis, the farthest spot in the orbit from Saturn. |
| When the line of apsides points towards the Sun, the eccentricity reaches a maximum. |
| The angle between Mars and the line of apsides is greater than 90 degrees in the unbisected vicarious hypothesis, and less than 90 degrees in the bisected version. |
| At time II the line of apsides has turned through 90 degrees and we get a symmetric eclipse, indistinguishable from a circular orbit. |
| However, the speed of the apsides is very much slower than in the figure. |
| For the moon, the line of apsides completes one revolution around the sky in a period of 8.85 years. |
