"खगोलीय इकाई": अवतरणों में अंतर
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पंक्ति 4:
'''खगोलीय इकाई''' ('''AU''' या '''au''' या '''a.u.''' या यद कदा '''ua''') [[लम्बाई]] की इकाई है, जो लगभग 150 मिलियन [[सहस्रमान|किलोमीटर]] है और पृथ्वी से सूर्य की दूरी पर आधारित है। इसकी सही सही मान है 149,597,870,691 [[Plus-minus sign|±]] 30 मीटर (लगभग 150 मिलियन किलोमीटर या 93 मिलियन मील).
इसका चिन्ह ''ua'' [[अन्तर्राष्ट्रीय भार एवं माप ब्यूरो]] द्वारा अनुमोदित है।<ref>{{SIbrochure|page=126}},</ref> लेकिन अंग्रेजी बोलते देशों में इसका उल्टा रूप - ''au'' - प्रचलित है।<ref>
== इतिहास ==
पंक्ति 48:
== सन्दर्भ ==
* E. Myles Standish. "Report of the IAU WGAS Sub-group on Numerical Standards". In ''Highlights of Astronomy'', I. Appenzeller, ed. Dordrecht: Kluwer Academic Publishers, 1995. ''(Complete report available online: [https://web.archive.org/web/20060208115515/http://ssd.jpl.nasa.gov/iau-comm4/iausgnsrpt.ps PostScript]. Tables from the report also available: [https://web.archive.org/web/20080906180801/http://ssd.jpl.nasa.gov/astro_constants.html Astrodynamic Constants and Parameters])''
* D. D. McCarthy ed., IERS Conventions (1996), IERS Technical Note 21, Observatoire de Paris, July 1996
{{reflist}}
== बाहरी कडि़यां ==
* ''[https://web.archive.org/web/20080525161241/http://www.sil.si.edu/exhibitions/chasing-venus/intro.htm Chasing Venus, Observing the Transits of Venus]'' Smithsonian Institution Libraries
* [https://web.archive.org/web/20091031222735/http://physics.nist.gov/cuu/Units/outside.html Units outside the SI] ''(at the [[NIST]] web site)''
* [https://web.archive.org/web/20070216041250/http://www.iau.org/Units.234.0.html Recommendations concerning Units] ''(at the [[International Astronomical Union|IAU]] web site)''
* [https://web.archive.org/web/20151001101700/http://arxiv.org/ftp/arxiv/papers/0801/0801.3807.pdf Solar Mass Loss, the Astronomical Unit, and the Scale of the Solar System] ''(a discussion of the relation between the AU and other quantities)''
* [https://web.archive.org/web/20080420174114/http://space.newscientist.com/article/dn13286-astronomical-unit-may-need-to-be-redefined.html?feedId=online-news_rss20 AU may need to be redefined] ''(measuring distances in AU will become increasingly imprecise as the Sun radiates away its energy)'' New Scientist, ''6 फ़रवरी 2008''
[[श्रेणी:खगोल शास्त्र में लम्बाई की इकाइयाँ]]
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