( 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 '' . 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 '' .