Buy Me a Coffee at ko-fi.com

Argument of periapsis

one of the orbital elements used to specify the orbit of an object in space

Pronunciation
/ˈɑːɡjʊmənt əv ˌpɛrɪˈapsɪs/
/ˈɑrɡjəmənt əv ˌpɛriˈæpsɪs/