Astronomska jedinica

Astronomska jedinica(hrvatska kraticaAJiliaj,međunarodna kratica odeng.AU, skraćeno odAstronomical Unit) jestmjerna jedinicazaduljinu.Međunarodni ured za mjere i utegepredlaže oznaku za astronomsku jedinicuua.^[1]

Upotrebljava se uastronomijii približno je jednaka prosječnoj udaljenostiZemljeodSunca,odnosnovelikoj poluosiZemljineorbite.Trenutno prihvaćena vrijednost te udaljenosti jednaka je 149 597 870 691 ± 30metara(približno 150 milijunakilometara).^[1]Do 2012. astronomska jedinica bila je definirana u okviru Zemljine orbite, ali odonda se definira kao točno 149 597 870 700 metara.^[2]

Izvori

↑^a ^bThe International System of Units (SI), 8. izdanje, 2006, strana 126
↑RESOLUTION B2 on the re-definition of the astronomical unit of length(PDF).International Astronomical Union. Beijing. 31. kolovoza 2012.The XXVIII General Assembly of International Astronomical Union recommends [adopted] that the astronomical unit be re-defined to be a conventional unit of length equal to exactly 149,597,870,700 metres, in agreement with the value adopted in IAU 2009 Resolution B2

[The_International_System_of_Units-1] The International System of Units (SI), 8. izdanje, 2006, strana 126

[2] RESOLUTION B2 on the re-definition of the astronomical unit of length(PDF).International Astronomical Union. Beijing. 31. kolovoza 2012.The XXVIII General Assembly of International Astronomical Union recommends [adopted] that the astronomical unit be re-defined to be a conventional unit of length equal to exactly 149,597,870,700 metres, in agreement with the value adopted in IAU 2009 Resolution B2

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