E joar is den omlooptyd van d' eirde die droait in zyn boane roend de zunne.
Volgns de gregorioansche kalender telt e joar 365 doagn. In de regel om de vier joar wordt doar e dag bygeteld vo te compenseern vo 't feit da 't droain roend de zunne nie juste in hêele doagn te meetn is. Da joar wordt ton e schrikkeljoar genoemd. De gregorioansche kalender deurt gemiddeld 365,2425 doagn (365d 5eu 49m 12s).
E joar die van 1 januoari toet 31 december lopt, wordt e kalenderjoar genoemd. In 't oenderwys werkn ze met e schooljoar, lêerjoar, collegejoar of academisch joar. Da joar begunt achter de zomervakanse, in september.
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