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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。 闰年是对地球绕太阳运转所需时间和公历时间之差所作的调整。公历规定一年有365天，而实际上地球绕太阳公转一周所需的时间是365天5小时48分46秒。如果不算上这个差值的话，那么每四年我们就要少掉一天，所以才有了2月29日。 2.Why February 29? 为什么偏偏是2月29日？ Our calendar is based on the early Roman calendar, which had only 10 months beginning in March。 我们现在使用的公历是基于早期的罗马日历，当时一年只有10个月，三月份为一年的开始。 January and February were added around 700 BCE by Numa Pompilius to reflect a lunar calendar; this made February the last month of the year。 一月和二月是在公元前700年左右，由第二代罗马国王怒马-庞皮利乌斯加上去的，是为了与阴历相匹配。因此，二月就成了一年中最后的一个月份了。 Julius Caesar introduced Leap Years around 45BCE by adding one day to the last month of the calendar year, February。 | 
