Original: For specific types of orbits , words such as '' perihelion '' ( for Sun-centered orbits ) , '' perigee '' ( for Earth-centered orbits ) , '' periastron '' ( for orbits around stars ) and so on may replace the word '' periapsis '' .
Simplified: ( For specific types of orbits , words such as '' perihelion '' ( for Sun-centered orbits ) , '' perigee '' ( for Earth-centered orbits ) , '' pericenter '' ( general ) , etc. may replace the word '' periapsis '' .