What is the relationship between Periapsis and Apoapsis longitude ? Are they 180° apart ? (ie) Periapsis + 180° = Apoapsis ?

Related question: if apoapsis is not known, what orbital elements are required to compute it ?


The periapsis and apoapsis are 180° apart. According to Kepler's first law, an orbit is an ellipse with the central body at one focus. The periapsis (P), central body (F), and apoapsis (A) all lie on the major axis of that ellipse.

Elliptical orbit

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.