Yilona phepha eliveza isikhathi sonyaka (i-calendar) lethu leli. Sekushoda kwona ukuthi isikhathi kube wu-GMT+4 ngesikhathi sehlobo bese kube wu-GMT+2:30 zonke ezinye izikhathi zonyaka. INCAZELO UKUBALA ISIKHATHI SONYAKA Inyanga iyisikhathi esithathwa yinyanga egcwele ukuthi ibe yinyanga emnyama. Loku kuvamise ukuba yizinsuku ezingama- 28 . Isikathi esidlulayo ukuze umuhlaba ajikeleze ilanga, kuyizinsuku ezingama- 365,25 . 365÷28= 13,0357... kunezinyanga ezingama- 13 enyakeni owodwa. 28 (izinsuku zenyanga) × 13 (izinyanga) = 364 izinsuku kunyaka. Kodwa ngoba uma senza zibe ngama-364 izinsuku kunyaka, kuyohamba kweqane kancane njalo ngonyaka kuze kweqane kakhulu ngokuhamba iminyaka. Yingakho kubalulekile ukuwenza unyaka abe yizinsuku ezingama-365 bese kwengeziwe usuku kunyaka owodwa njalo eminyakeni emine ukuqhaphela isibalo sezinsuku ezikunyaka sezabafundi bemikhathi, ezingama-365,25.
