读者朋友,当你翻开1996年新日历时,你会发现公历2月份是29天,全年有366天,比一九九五年多一天。你知道这是怎么回事吗?目前世界通用的公历是以地球绕太阳公转一周的“回归年”为依据的。一“回归年”是365,2422天,即365天5小时48分46秒。为了使用方便,就将365天作为公历平年的一年。这样平年每年要剩下5小时48分46秒,累积到4年就有23小时15分4秒,几乎近一天的时间。如果累积到400年,就会多出97天来。这样久而 Readers, When you open the new calendar in 1996, you will find that the Gregorian calendar in February is 29 days, 366 days a year, one day more than in 1995. Do you know what’s going on? The world’s common Gregorian calendar is based on the “year of the return” of the Earth’s revolution around the sun. A “return year” is 365,2422 days, that is 365 days 5 hours 48 minutes 46 seconds. For ease of use, we will 365 days as a year of the Gregorian calendar. This year every year to the remaining 5 hours 48 minutes 46 seconds, accumulated to 4 years there are 23 hours 15 minutes 4 seconds, almost a day’s time. If accumulated to 400 years, it will be more than 97 days. So long