astronomical unit

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astronomical unit

noun astronomical units

149,597,870,700 metres, the approximate mean distance from the Earth to the Sun (the semi-major axis of Earth's orbit), (symbol AU), used to measure distances in the solar system. Now this big quarter of a Jupiter mass planet is in an orbit about Zeta 2 Reticuli which lasts 18.9 days and has a Semi-Major Axis of 0.14 Astronomical Unit (AU). For comparison Mercury has a Semi-Major Axis of 0.387 AU equal to 36 million miles and Earth has a Semi-Major Axis of 1.00 AU equal to 92
Similar: A.U., a.u., AU, au, ua, ㍳, a. u., A. U.

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noun measure of distance

Español	unidad astronómica
한국어	천문단위 cheonmun danwi
日本語	天文単位 tenmon tan'i
中文	天文單位 /天文单位 tiānwén dānwèi
हिन्दी	खगोलीय इकाई khagolīya ikāī
Português	unidade astronômica, unidade astronómica
Français	unité astronomique
Deutsch	Astronomische Einheit
Italiano	unità astronomica
Ελληνικά	αστρονομική μονάδα astronomikí monáda
Română	unitate astronomică
Русский	астрономи́ческая едини́ца astronomíčeskaja jediníca
العربية	وَحْدَة فَلَكِيَّة waḥda falakiyya
עברית	יחידה אסטרונומית yekhida astronomit

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MLA

"astronomical unit." Wiktionary, via Micwyn, micwyn.com/word/astronomical%20unit. Accessed 6 Nov. 2026.

APA

astronomical unit. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/astronomical%20unit

Chicago

"astronomical unit." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/astronomical%20unit.

BibTeX

@misc{astronomical_unit_2026,
  title = {astronomical unit},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/astronomical%20unit},
  urldate = {2026-11-06}
}