儒略曆(Julian calendar)是羅馬個凱撒勒公元前46年造出來個,由埃及數學兼天文學家亞歷山大索西琴尼設計個日曆。公元前46年1月1號開始用,代替脫老早個羅馬曆法。
儒略曆一年分12個號頭,四年一閏,平年365日天,閏年個2月加一日天,叫「閏日」,每年平均長度是365.25日天。必過地球公轉週期比365.25日天稍微短著點,儒略曆有蠻大個誤差,1582年過後教宗格里高利十三世改仔一眼眼,變成格里曆,就是現在叫個公曆,一直用到今朝頭。
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