| At time II the line of apsides has turned through 90 degrees and we get a symmetric eclipse, indistinguishable from a circular orbit. |
| The line of the apsides of the moon's orbit revolves from west to east, through her whole course, in about nine years. |
| When the line of apsides points towards the Sun, the eccentricity reaches a maximum. |
| This secular displacement of the line of the apsides brings a sixth complication to the motion of our abiding-place. |
| 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. |
| The angle through which the radius vector rotates in going between two consecutive apsides is called the apsidal angle. |
