作者: 严芳 时间: 2012-2-29 17:12
1.Why do we need leap years?
为什么我们需要闰年？
Leap years are necessary to keep our calendar in alignment with the Earth’s revolutions around the sun. Since our calendar has exactly 365 days in a year, we would lose almost six hours from our calendar every year if we did not add February 29 to every fourth year.
Julius Caesar introduced Leap Years around 45BCE by adding one day to the last month of the calendar year, February.
公元前458年，凯撒引进了闰年的概念，在一年的最后一个月加上一天，也就是在二月加上一天。
3.How to calculate a leap year?
如何计算闰年？
Caesar declared that every year evenly divisible by four would be a leap year. While simple, this rule actually created too many leap years to keep the Roman and lunar calendars aligned. More than 1500 years later, a new formula was introduced with the Gregorian Calendar, which we still use today.
6.You won’t see another February 29 for 1460 days!
你要再过1460天才会遇到下一个2月29日！
7.Custom allows marriage-minded gals to propose to their boyfriends on February 29. Leap Year has been the traditional time that women can propose marriage.
