April Fools' Day, sometimes called All Fools' Day, is one of the most light-hearted days of the year. Some see it as a celebration related to the turn of the seasons, while others believe it stems from the adoption of a new calendar. 愚人節(jié)的英語(yǔ)是April Fools’ Day，也叫做All Fools’ Day。有些人相信愚人節(jié)是為了慶祝季節(jié)變更，有些人則相信這是因?yàn)槟隁v的變更才形成的節(jié)日。 Ancient cultures, including those of the Romans and Hindus, celebrated New Year's Day on or around April 1. It closely follows the vernal equinox (March 20th or March 21st.) In medieval times, much of Europe celebrated March 25, the Feast of Annunciation, as the beginning of the new year. 古代文化，比如古羅馬和印度文化，都在4月1日左右慶祝胡新年。這個(gè)日子和春分（3月20日或者21日）很靠近。在中世紀(jì)時(shí)期，歐洲大多數(shù)國(guó)家在3月25日慶?！笆ツ割I(lǐng)報(bào)”，這一天被看作是新年的第一天。 In 1582, Pope Gregory XIII ordered a new calendar (the Gregorian Calendar) to replace the old Julian Calendar. The new calendar called for New Year's Day to be celebrated Jan. According to a popular explanation, many people either refused to accept the new date, or did not learn about it, and continued to celebrate New Year's Day on April 1. Other people began to make fun of these traditionalists, sending them on "fool's errands" or trying to trick them into believing something false. Eventually, the practice spread throughout Europe.