translate English to German: Line of Apsides: The apsides are the points of an orbit of one body around another is either greatest or least. As for the earth the line of apsides is the line betwenn ⇒ aphelion and ⇒ perihelion, while the moon's line of apsides goes from ⇒ apogee to ⇒ perigee.
Knotenlinie: Verbindungslinie zwischen den beiden ⇒ Knoten der Bahn eines Himmelskörpers.