The two are joined by a diameter called the line of the apsides.
The line of apsides of a large proportion of comets will be approximately coincident with the solar orbit.
The line of the apsides of the moon's orbit revolves from west to east, through her whole course, in about nine years.
The “line of apsides” is that which joins them, forming the major axis of the orbit.
This secular displacement of the line of the apsides brings a sixth complication to the motion of our abiding-place.
This point was called "the excentric," and the line from the excentric to the Earth was called "the line of apsides."
Plural apsides (āp'sĭ-dēz')
In the path of an orbiting body, either of the two points at which it is closest to or farthest away from the body it is orbiting. See also apoapsis, periapsis.