Juliansk år

Ett juliansk år (symbol a) er en tidsenhet definert som nøyaktig 365,25 døgn á 86 400 sekunder (ett juliansk døgn). Totalt utgjør dette 31 557 600 sekunder. Det er den gjennomsnittlige lengden av ett år i den julianske kalenderen, som tidligere ble brukt i Vesten. Det julianske året er litt lenger enn et tropisk år og dette lille avviket hopet seg opp over tid (for eksempel kom vårjevndøgn stadig tidligere på kalenderen). Den gregorianske kalender korrigerte for dette og i 1582 hoppet man i det katolske Europa over 11 dager i oktober for å komme i takt med sola.[1][2][3][4] Siden et juliansk år kun er et mål på tid, korresponderer ikke et juliansk år med den julianske kalenderen eller noen annen kalender. Juliansk år er mye brukt av astronomer som tidsenhet der det ville vært tungvint å bruke dager.[trenger referanse]

Se også

Referanser

  1. ^ Alexander, Anton (1970). Matematisk geografi. Oslo: Aschehoug. 
  2. ^ Ovaldsen, Jan-Erik (2005). Himmelkalenderen 2006. Trondheim: Tapir akademisk forl. ISBN 8251920876. 
  3. ^ Aschehougs konversasjonsleksikon. Bind 10. Oslo: Aschehoug. 1970. ISBN 8203061338. 
  4. ^ Elgarøy, Øystein (1983). Det forunderlige univers. Oslo: Universitetsforlaget. ISBN 8200064492. 
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