periapsisn.

Brit.

/ˌpɛrɪˈapsɪs/, U.S.

/ˌpɛriˈæpsɪs/

Inflections: Plural periapses.

Origin: Formed within English, by derivation. Etymons: peri- prefix, apsis n.

Etymology: < peri- prefix + apsis n., after e.g. perigee n., perihelion n.

Astronomy and Astronautics.

The point in the path of an orbiting celestial object or spacecraft at which it is closest to the primary. Also: The point in the path of a ray of light at which it is closest to a specified object.

ΘΚΠ

the world > the universe > planet > primary planet > secondary planet, satellite > [noun] > position

periapsis1959

periapse1974

1959 K. A. Ehricke in H. S. Seifert Space Technol. viii. 18 It is convenient to define the body's position with respect to the periapsis.

1979 Science 14 Sept. 1133/3 These components would consist of two distorted elliptical images at the near and far limbs defined by the two ray periapses.

1993 K. S. Robinson Green Mars (new ed.) 72 The asteroid was in an elliptical orbit with a periapsis of around fifty thousand kilometres.

This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).

单词	periapsis
释义	periapsisn. Brit. /ˌpɛrɪˈapsɪs/, U.S. /ˌpɛriˈæpsɪs/ Inflections: Plural periapses. Origin: Formed within English, by derivation. Etymons: peri- prefix, apsis n. Etymology: < peri- prefix + apsis n., after e.g. perigee n., perihelion n. Astronomy and Astronautics. The point in the path of an orbiting celestial object or spacecraft at which it is closest to the primary. Also: The point in the path of a ray of light at which it is closest to a specified object. ΘΚΠ the world > the universe > planet > primary planet > secondary planet, satellite > [noun] > position periapsis1959 periapse1974 1959 K. A. Ehricke in H. S. Seifert Space Technol. viii. 18 It is convenient to define the body's position with respect to the periapsis. 1979 Science 14 Sept. 1133/3 These components would consist of two distorted elliptical images at the near and far limbs defined by the two ray periapses. 1993 K. S. Robinson Green Mars (new ed.) 72 The asteroid was in an elliptical orbit with a periapsis of around fifty thousand kilometres. This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022). < n.1959
随便看	outlaw strike outlawed outlawer outlawest outlawing outlawries outlawry outlaws outlawwer outlawwest outlay outlayer outlaying outlays outlead outleading outleads outleaf outlean outleap outleaped outleaping outleaps outleapt outlearn