Apsides

Apsides refer to the two extreme points in the orbit of a celestial body around another body. These points represent the closest and farthest distances the orbiting object can attain from the central body. Apsides play a crucial role in comprehending the shape and dynamics of orbits.

Each apsis for an object orbiting the Earth is named “apogee” for the farthest point and “perigee” for the closest point.