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Astronomical unit
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== External links == * [https://web.archive.org/web/20250310001225/http://www.iau.org/public/themes/measuring/ The IAU and astronomical units], archived 10 Mar 2025 * [https://web.archive.org/web/20070216041250/http://www.iau.org/Units.234.0.html Recommendations concerning Units] (HTML version of the IAU Style Manual), archived 16 Feb 2007 * [http://www.sil.si.edu/exhibitions/chasing-venus/intro.htm Chasing Venus, Observing the Transits of Venus] * [http://www.transitofvenus.org/ Transit of Venus] {{Units of length used in Astronomy}} {{SI units}} {{Portal bar|Astronomy|Stars|Spaceflight|Outer space|Solar System|Science}} {{Authority control}} {{DEFAULTSORT:Astronomical Unit}} [[Category:Celestial mechanics]] [[Category:Units of measurement in astronomy|Unit]] [[Category:Units of length]]
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