Periapsis

Domain	Definitions
Aerospace	The orbital point nearest the center of attraction. See orbit. (references)
Geography	Point in the orbit of a satellite or planet which is at a minimum distance from the centre of mass of the primary body. Source: European Union. (references)
Physics	The point in the orbit closest to the planet. (references)
Space	The point in an orbit closest to the body being orbited. (references)
Source: compiled by the editor from various references; see credits.

Specialty Definition: Periapsis

Given two objects of which one orbits the other, for example a planet and a satellite, periapsis is the point in the satellite's orbit which is closest (at the smallest distance) from the planet.

If the object orbits the Earth, it's also known as perigee.
If the object orbits the Sun, it's also known as perihelion.
If the object orbits the Moon, it's also known as perilune.

The point of farthest approach is the apoapsis. According to Kepler's laws of planetary motion, as a planet travels in an elliptical orbit, around a star; as the planet approaches the periapsis; it will increase in velocity.

Expression: Periapsis

Modern Translations: Periapsis

Language		Translations for "periapsis"; alternative meanings/domain in parentheses.
Danish		perifocus (periastron, perifocus), periapside (periastron, perifocus). (various references)

Dutch		perifocus (periastron, perifocus), periastron (periastron, perifocus), periapsis (periastron, perifocus). (various references)

French		périastre (periastron, perifocus), périapside (periastron, perifocus), apside inférieure (periastron, perifocus). (various references)

German		Perigäum (periastron, perifocus, perigee), Periapside (periastron, perifocus). (various references)

Greek		κάτω αψίδα (periastron, perifocus), περιαψίδα (periastron, perifocus), περίαστρο (periastron, perifocus). (various references)

Italian		periastro (periastron, perifocus), apside inferiore (periastron, perifocus). (various references)

Pig Latin		eriapsispay

Spanish		periastro (periastron, perifocus), periápside (periastron, perifocus), ápside inferior (periastron, perifocus). (various references)
Source: compiled by the editor from various translation references.

Anagrams: Periapsis

Scrabble® Enable2K-Verified Anagrams
	Words within the letters "a-e-i-i-p-p-r-s-s"
	-1 letter: apprises.
	-2 letters: apprise, aspires, paresis, parises, praises, sappers, sappier, sippers, spireas.
	-3 letters: arises, aspers, aspire, irises, papers, paries, parses, passer, pipers, pipier, pisser, praise, prases, priapi, prises, raises, repass, sapper, sepias, serais, sipper, spares, sparse, spears, speirs, spiers, spirea, spires.
	-4 letters: apers, apres, apses, apsis, arise, arses, arsis, asper, aspis, issei, pairs, paise, paper.
	Words containing the letters "a-e-i-i-p-p-r-s-s"
	+1 letter: papistries.
	+2 letters: periphrasis.
	+3 letters: epigraphists, primateships.
	+4 letters: perspicacious, perspirations.
	+5 letters: perspicacities, physiographies, precapitalists, spinthariscope.
Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro.