apastronn.

Brit.

/aˈpastr(ə)n/, U.S.

/æˈpæstrən/

Inflections: Plural apastra, apastrons.

Origin: A borrowing from Greek, combined with an English element. Etymons: apo- prefix, Greek ἄστρον.

Etymology: < apo- prefix + ancient Greek ἄστρον star (see astro- comb. form), after aphelion n.

Astronomy.

The point in the path of a celestial object orbiting a star at which it is farthest from the star. Cf. periastron n.

ΚΠ

1844 W. H. Smyth Cycle Celestial Objects II. 388 B had lately passed its apastron in the south-east portion of its orbit, and..is slackening its march.

1888 Dublin Rev. Jan. 193 These [stars]..gradually slacken until, at ap-astron, they touch the opposite extreme of pre-eminent sluggishness.

1918 R. G. Aitken Binary Stars vi. 156 The point of widest separation of the circle divisions corresponds to periastron, that of least separation to apastron.

1948 Publ. Astron. Soc. Pacific 60 162 They [sc. two stars] recede from each other..until they reach the point of greatest separation, or apastron.

1982 B. Aldiss Helliconia Spring iii. 113 The planet was now several centuries past apastron, the coldest part of its orbit.

2006 D. Darling Gravity's Arc ix. 203 The gravitational field alternately strengthens at periastron and weakens at apastron.

This is a new entry (OED Third Edition, December 2012; most recently modified version published online March 2022).

单词	apastron
释义	apastronn. Brit. /aˈpastr(ə)n/, U.S. /æˈpæstrən/ Inflections: Plural apastra, apastrons. Origin: A borrowing from Greek, combined with an English element. Etymons: apo- prefix, Greek ἄστρον. Etymology: < apo- prefix + ancient Greek ἄστρον star (see astro- comb. form), after aphelion n. Astronomy. The point in the path of a celestial object orbiting a star at which it is farthest from the star. Cf. periastron n. ΚΠ 1844 W. H. Smyth Cycle Celestial Objects II. 388 B had lately passed its apastron in the south-east portion of its orbit, and..is slackening its march. 1888 Dublin Rev. Jan. 193 These [stars]..gradually slacken until, at ap-astron, they touch the opposite extreme of pre-eminent sluggishness. 1918 R. G. Aitken Binary Stars vi. 156 The point of widest separation of the circle divisions corresponds to periastron, that of least separation to apastron. 1948 Publ. Astron. Soc. Pacific 60 162 They [sc. two stars] recede from each other..until they reach the point of greatest separation, or apastron. 1982 B. Aldiss Helliconia Spring iii. 113 The planet was now several centuries past apastron, the coldest part of its orbit. 2006 D. Darling Gravity's Arc ix. 203 The gravitational field alternately strengthens at periastron and weakens at apastron. This is a new entry (OED Third Edition, December 2012; most recently modified version published online March 2022). < n.1844
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