Definition:Peri-

Definition

Let $A$ be a body in elliptical orbit $O$ around another body $B$.

Peri- is a prefix which indicates the closer of the two apsides of $O$ to the center of mass of $B$.

Also see

• Definition:Perihelion
• Definition:Perigee

• Definition:Ap-

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): apse (plural apsides)
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): apsis (plural apsides)