Raws li Julian daim ntawv qhia hnub, lub xyoo uas muaj lub Ob Hlis 29, thiab cov hnub muaj 366, yog hu ua xyoo dhau los. Txhua xyoo plaub, ntxiv rau ib hnub yog ntxiv rau qhov niaj zaus 28 hnub ntawm Lub Ob Hlis. Txawm li cas los xij, qhov kev teeb tsa no rau kev suav cov xyoo dhau los tom qab tau txais yuav Gregorian daim ntawv teev xyoo 1582 yuav tsum tau hloov.
Cov Lus Qhia
Kauj ruam 1
Faib cov lej muaj nuj nqis ntawm lub xyoo los ntawm 4. Xyoo uas faib tsis tau 4 yog tsis leap xyoos.
Piv txwv.
Xyoo 2008/4 = 502
2011/4 = 502, 75
2008 yog xyoo leap (sib faib nrog tsis muaj khoom seem), raws li txoj cai ntawm qib 1, 2011 tsis yog xyoo leap (sib faib nrog ib seem).
Kauj ruam 2
Tom qab ua tiav kauj ruam 1, faib cov lej xyoo ntawm 100.
Yog hais tias ib xyoos tau faib tawm los ntawm 100 yam tsis muaj qhov seem, xyoo ntawd yuav tsis yog qhov dhau xyoo, txawm tias nws tau faib ua tiav 4.
Piv txwv.
2104/4 = 526
2104 / 100 = 21, 04
Xyoo 2104 yog qhov ntau ntawm 4, tab sis tsis yog siv ntau ntawm 100 (thaum muab faib, cov seem tau txais).
Raws li txoj cai ntawm nqe 2, nws yog tus lej xyoo. 2100/4 = 525
2100 / 100 = 21
Xyoo 2100 yog qhov ntau ntawm 4, tab sis yog siv ntau ntawm 100. Raws li txoj cai ntawm kauj ruam 2, nws tsis yog qhov lej xyoo.
Tab sis tej zaum yuav muaj kev zam ntawm no ib yam thiab. Txhawm rau kev suav tseeb, ua raws kauj ruam 3.
Kauj ruam 3
Nws yog ib qho tsim nyog yuav faib rau lub xyoo, cov lej muaj nuj nqis ntawm qhov uas tau tig los ua ntau tus ntawm 4 thiab 100, los ntawm 400. Yog tias nws tau muab faib yam tsis muaj cov khoom seem, ces lub xyoo yog, tom qab tag nrho, xyoo leap!
Piv txwv.
2100/4 = 525
2100 / 100 = 21
2100 / 400 = 5, 25
2100 tsis yog qhov ntau ntawm 400, uas txhais tau tias, raws li txhua txoj cai, nws tsis yog leap xyoo 2000/4 = 500
2000 / 100 = 20
2000 / 400 = 5
Xyoo 2000 tuaj yeem faib tau los ntawm 4, los ntawm 100, tab sis kuj yog 400. Yog li ntawd, raws li txoj cai ntawm kauj ruam 3, nws yog xyoo leap.
