<P> The Julian calendar , proposed by Julius Caesar in 46 BC ( 708 AUC ) , was a reform of the Roman calendar . It took effect on 1 January 45 BC ( AUC 709 ) , by edict . It was the predominant calendar in the Roman world , most of Europe , and in European settlements in the Americas and elsewhere , until it was refined and gradually replaced by the Gregorian calendar , promulgated in 1582 by Pope Gregory XIII . The Julian calendar gains against the mean tropical year at the rate of one day in 128 years . For the Gregorian the figure is one day in 3,030 years . The difference in the average length of the year between Julian ( 365.25 days ) and Gregorian ( 365.2425 days ) is 0.002 % . </P>
<P> The Julian calendar , proposed by Julius Caesar in 46 BC ( 708 AUC ) , was a reform of the Roman calendar . It took effect on 1 January 45 BC ( AUC 709 ) , by edict . It was the predominant calendar in the Roman world , most of Europe , and in European settlements in the Americas and elsewhere , until it was refined and gradually replaced by the Gregorian calendar , promulgated in 1582 by Pope Gregory XIII . The Julian calendar gains against the mean tropical year at the rate of one day in 128 years . For the Gregorian the figure is one day in 3,030 years . The difference in the average length of the year between Julian ( 365.25 days ) and Gregorian ( 365.2425 days ) is 0.002 % . </P>
who made up the names of the months
who made up the names of the months
Julius Caesar
Julius Caesar