The formal word for apogee is : Apsis (Greek: ἁψίς, gen. ἁψίδος) which is the Greek name for : Arc
In astronomy, Apogee,  is used to describe the farthest point of an object orbiting the Earth, in its trajectory.

Amongst the various things that Pixinsight does pretty awesomely, there are hidden routines to help you annotate astronomical images.