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公元2000年是本世纪的最后一年。这一年为闰年,全年有366天,比平年多了一天,你知道20世纪的这最后一年为何会多一天吗?公元纪年法是以地球绕太阳运转为根据的历法。地球绕太阳一周为一回归年,一回归年的实际时间为365天5小时48分46秒,约等于365.2422天。然而历法纪年不能使一年的总天数带有小数,所以,一般只能以365天为一年,称为平年。每年余下的5小时48分46秒待4年后累积为23小时15分4秒时,作为一天,加在当年的二月份,当年就叫做闰年,共有366天。确定闰年的方法,是以公元年数能被4整除的年份为闰年,然而使用这种方法达128年左右时,就又多算了约1天,
Year 2000 is the last year of this century. This year is a leap year, with 366 days a year, one day more than usual. Do you know one more day in the last year of the 20th century? The Advocate Annals Act is a calendar based on the earth’s orbiting sun. Earth around the sun for a return to the year, the actual time to return to 365 days 5 hours 48 minutes and 46 seconds, equal to about 365.2422 days. However, the calendar year can not bring the total number of days a year with a decimal, so generally only 365 days a year, known as the flat year. The remaining 5 hours 48 minutes and 46 seconds each year to be accumulated after 4 years 23 hours and 15 minutes and 4 seconds, as a day, plus the year of February, then called leap year, a total of 366 days. The method of determining the leap year is based on a year in which the year of AD can be divided by 4 to be a leap year. However, when using this method for about 128 years, it takes another day for about one more day,