2月29日你不可不知的七件事
<p>1.<span word="Why">Why</span> <span word="do">do</span> <span word="we">we</span> <span word="need">need</span> <span word="leap">leap</span> <span word="years">years</span>?</p><p>为什么我们需要闰年？</p><p><span word="Leap">Leap</span> <span word="years">years</span> <span word="are">are</span> <span word="necessary">necessary</span> <span word="to">to</span> <span word="keep">keep</span> <span word="our">our</span> <span word="calendar">calendar</span> <span word="in">in</span> <span word="alignment">alignment</span> <span word="with">with</span> <span word="the">the</span> <span word="Earth">Earth</span>’<span word="s">s</span> <span word="revolutions">revolutions</span> <span word="around">around</span> <span word="the">the</span> <span word="sun">sun</span>. <span word="Since">Since</span> <span word="our">our</span> <span word="calendar">calendar</span> <span word="has">has</span> <span word="exactly">exactly</span> 365 <span word="days">days</span> <span word="in">in</span> <span word="a">a</span> <span word="year">year</span>, <span word="we">we</span> <span word="would">would</span> <span word="lose">lose</span> <span word="almost">almost</span> <span word="six">six</span> <span word="hours">hours</span> <span word="from">from</span> <span word="our">our</span> <span word="calendar">calendar</span> <span word="every">every</span> <span word="year">year</span> <span word="if">if</span> <span word="we">we</span> <span word="did">did</span> <span word="not">not</span> <span word="add">add</span> <span word="February">February</span> 29 <span word="to">to</span> <span word="every">every</span> <span word="fourth">fourth</span> <span word="year">year</span>。</p><p>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。</p><p>2.<span word="Why">Why</span> <span word="February">February</span> 29?</p><p>为什么偏偏是2月29日？</p><p><span word="Our">Our</span> <span word="calendar">calendar</span> <span word="is">is</span> <span word="based">based</span> <span word="on">on</span> <span word="the">the</span> <span word="early">early</span> <span word="Roman">Roman</span> <span word="calendar">calendar</span>, <span word="which">which</span> <span word="had">had</span> <span word="only">only</span> 10 <span word="months">months</span> <span word="beginning">beginning</span> <span word="in">in</span> <span word="March">March</span>。</p><p>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。</p><p><span word="January">January</span> <span word="and">and</span> <span word="February">February</span> <span word="were">were</span> <span word="added">added</span> <span word="around">around</span> 700 <span word="BCE">BCE</span> <span word="by">by</span> <span word="Numa">Numa</span> <span word="Pompilius">Pompilius</span> <span word="to">to</span> <span word="reflect">reflect</span> <span word="a">a</span> <span word="lunar">lunar</span> <span word="calendar">calendar</span>; <span word="this">this</span> <span word="made">made</span> <span word="February">February</span> <span word="the">the</span> <span word="last">last</span> <span word="month">month</span> <span word="of">of</span> <span word="the">the</span> <span word="year">year</span>。</p><p>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。</p><p><span word="Julius">Julius</span> <span word="Caesar">Caesar</span> <span word="introduced">introduced</span> <span word="Leap">Leap</span> <span word="Years">Years</span> <span word="around">around</span> 45<span word="BCE">BCE</span> <span word="by">by</span> <span word="adding">adding</span> <span word="one">one</span> <span word="day">day</span> <span word="to">to</span> <span word="the">the</span> <span word="last">last</span> <span word="month">month</span> <span word="of">of</span> <span word="the">the</span> <span word="calendar">calendar</span> <span word="year">year</span>, <span word="February">February</span>。</p>
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