Astronomska jedinica

Astronomska jedinica (hrvatska kratica AJ ili aj , međunarodna kratica od eng. AU, skra?eno od Astronomical Unit ) jest mjerna jedinica za duljinu . Međunarodni ured za mjere i utege predla?e oznaku za astronomsku jedinicu ua . ^[1]

Upotrebljava se u astronomiji i pribli?no je jednaka prosje?noj udaljenosti Zemlje od Sunca , odnosno velikoj poluosi Zemljine orbite . Trenutno prihva?ena vrijednost te udaljenosti jednaka je 149?597?870?691 ± 30 metara (pribli?no 150 milijuna kilometara ). ^[1] Do 2012. astronomska jedinica bila je definirana u okviru Zemljine orbite, ali odonda se definira kao to?no 149?597?870?700 metara. ^[2]

Izvori [ uredi | uredi kod ]

↑ ^a ^b The 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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