Thissystemcouldhaveworked, every 19 years, lunarandsolarcalendarstendtolineup, soaddenoughleapmonthstokeeptheseasonsinorderandeventuallyeverythingwillresetitself.
Caesarhadspent a lotoftimeinEgypt, where 365-daycalendarswerealltherage, soin 46 BC, heflushedRome's lunarcalendardowntheaqueductandinstalled a solarcalendar.
JanuaryandFebruaryhadalreadybeenmovedtothebeginningoftheyear, andCaesaradded 10 daystodifferentmonthstoget a totalof 365.
1月と2月はすでに年頭に移動しており、シーザーは異なる月に10日ずつ足して合計365日にしました。
Andsince a tropicalyearis a tadlongerthan 365 days, Juliusadded a leapdayeveryfouryears, exceptthattheyinserteditafterFebruary 23, rightinthemiddleofthemonth.