'S e bliadhna le 366 làithean a tha ann am bliadhna-leum.
Tha bliadhnaichean-leum anns a' mhìosachan Iulianach agus anns a' mhìosachan Griogarach. Tha iad a' sioncronachadh a' mhìosachain ris na ràithean, air sgàth 's gu bheil 365.242190 làithean anns gach bliadhna thropaigeach. Tha 29 an Gearran na latha a bharrachd anns gach bliadhna-leum.
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