')Roman dictator Julius Caesar established the Julian calendar.
于是，改革历法就被提到日程上来。1545年，天主教的特伦特（the Council of Trent）会议批准了历法改革一案。
1582年，罗马教皇格里高利十三世（Pope Gregory XIII）正式颁布其所制新历，史称格里高利历（the Gregorian Calendar），就是我们现在使用的阳历。
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The truth is that the Catholic Church did not invent or devise the 365 day solar calendar, pagan Rome did. It is called the Julian calendar after Julius Caesar, who implemented it. The Julian calendar has a leap year every fourth year of 366 days. By the 16th century, the effect of the imprecision of the Julian calendar was becoming significant enough that it prompted the Catholic Gregorian (Pope Gregory XIII) calendar reform of 1582, in which Thursday, October 4th, was followed by Friday, October 15th. The method of adding leap years was also changed in order to stay in sync with the solar year. Note however, that the weekly cycle of 7 days, Sunday through Saturday, was NOT altered at all by the Gregorian calendar reform.
