Share this entry

Share this page

periapsis

Syllabification: per·i·ap·sis
Pronunciation: /ˌperēˈapsis
 
/

Definition of periapsis in English:

noun (plural periapses /-ˌsēz/)

Astronomy
The point in the path of an orbiting body at which it is nearest to the body that it orbits.
Example sentences
  • For objects orbiting Earth, periapsis and apoapsis are known as perigee and apogee; for objects orbiting the Sun, these locations are known as perihelion and aphelion.
  • At periapsis [closest approach to Saturn] it's about 40 kilometers per second [90,000 miles per hour].

Definition of periapsis in:

Share this entry

Share this page

 

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day cumbersome
Pronunciation: ˈkəmbərsəm
adjective
large or heavy and therefore difficult to carry…