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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54876&size=small" /></div> <h1 class="ph">上次发生在1897年！2月3日立春太罕见 </h1> <p class="xg1"> 时间：2017-2-3 11:06<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(952)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=5293&idtype=aid" title="查看全部评论"><em id="_commentnum">5</em></a></p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>在很多人的印象中，通常2月4日是立春的正日子，但是今年的立春却是2月3日。</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><div> 上次发生在1897年！2月3日立春太罕见 。今天是立春了， 天文专家表示，3日立春很罕见，上一次发生在1897年，距今120年，而再下一次则发生在2021年。据了解，24节气是根据太阳在黄道(即地球绕太阳公转的轨道)上的位置来划分的。视太阳从春分点(黄经零度，此刻太阳垂直照射赤道)出发，每前进15度为一个节气；运行一周又回到春分点，为一个回归年，合360度，因此分为24个节气。</div><div><br></div><div><p style="text-align: center;"><a href="data/attachment/portal/201702/03/110704j8j7q8lhb6qkrmm9.jpg" target="_blank"><img src="data/attachment/portal/201702/03/110704j8j7q8lhb6qkrmm9.jpg"></a></p><p style="text-align: center;"><br></p></div><div> 根据中国天文学会会员、天津市天文学会理事史志成介绍，<b><font color="#f00000">一个回归年的长度是365.2422天，因此每个节气在公历年中的时间段平均约为15.25天，其起始日期大体上也是固定的。但太阳的周年视运动并不均匀，而且历年的长度也不同，平年365天，闰年366天，因此节气的具体时间就会有微小的变化。</font></b><span style="line-height: 1.8em;"><b><font color="#f00000">对于同一个节气，每年都要比前一年滞后6小时或5小时，遇到闰年则要在此基础上提前24小时。</font></b>这样，在日期上的反映是，同一个节气在平年与前一年保持不变或滞后1天；在闰年与前一年保持不变或提前1天。这样一来，同一个节气的起始点就有3个不同的公历日期。以立春为例，就有2月3日、2月4日和2月5日这三种情况。</span></div><div><br></div><div> 史志成表示，1900年-2000年这一百年统计<a href="http://display.oecr.com" target="_blank" class="relatedlink">显示</a>，立春只有2月4日和2月5日这两天，没有2月3日，而本世纪100年的统计显示，立春只有2月3日和2月4日这两天，没有2月5日。<span style="line-height: 1.8em;">“按照天文年历显示，4日立春最常见。3日或5日立春尽管比较罕见，但也是正常历法现象，公众应该以一颗平常心来面对。”史志成强调说。大家是不是觉得很有意思呢？</span></div><div><span style="line-height: 1.8em;"><br></span></div><div><p style="text-align: center;"><a href="data/attachment/portal/201702/03/110544celctafjdlbc8u5u.jpg" target="_blank"><img src="data/attachment/portal/201702/03/110544celctafjdlbc8u5u.jpg"></a></p><p style="text-align: center;"><br></p><p style="text-align: 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<!--[diy=diycontentrelate]--><div id="diycontentrelate" class="area"></div><!--[/diy]--> <div id="comment" class="bm"> <div class="bm_h cl"> <a href="javascript:;" class="y xi2" onclick="location.href=location.href.replace(/(\#.*)/, '')+'#cform';$('message').focus();return false;">发表评论</a> <h3>最新评论</h3> </div> <div id="comment_ul" class="bm_c"> <p class="ptm pbm"><a href="http://www.oecr.com/portal.php?mod=comment&id=5293&idtype=aid" class="xi2">查看全部评论(<em id="_commentnum">5</em>)</a></p><form id="cform" name="cform" action="portal.php?mod=portalcp&ac=comment" method="post" autocomplete="off"> <div class="tedt"> <div class="area"> <textarea name="message" rows="3" class="pt" id="message" onkeydown="ctrlEnter(event, 'commentsubmit_btn');"></textarea> </div> </div> <div class="mtm"><span id="secqaa_qSFtSS7e"></span> <script type="text/javascript" reload="1">updatesecqaa('qSFtSS7e', '<sec> <span id="sec<hash>" onclick="showMenu(this.id);"><sec></span><div id="sec<hash>_menu" class="p_pop 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name="comment_anchor_10668"></a> <dl id="comment_10668_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(10668, '5293');">引用</a> </span> <a href="http://club.oecr.com/space-uid-43247.html" class="xi2 xw1" c="1">dabo2121</a> <span class="xg1 xw0">2017-2-3 19:36</span> </dt> <dd>LZ是天才，坚定完毕</dd> </dl><a name="comment_anchor_10667"></a> <dl id="comment_10667_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(10667, '5293');">引用</a> </span> <a href="http://club.oecr.com/space-uid-12902.html" class="xi2 xw1" c="1">Shalonbas</a> <span class="xg1 xw0">2017-2-3 19:06</span> </dt> <dd>非常好，顶一下</dd> </dl><a name="comment_anchor_10663"></a> <dl id="comment_10663_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(10663, '5293');">引用</a> </span> <a href="http://club.oecr.com/space-uid-71698.html" class="xi2 xw1" c="1">jiangliansj</a> <span class="xg1 xw0">2017-2-3 17:06</span> </dt> <dd>同学介绍来的，还不错。</dd> </dl><a name="comment_anchor_10652"></a> <dl id="comment_10652_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(10652, '5293');">引用</a> </span> <a href="http://club.oecr.com/space-uid-12902.html" class="xi2 xw1" c="1">Shalonbas</a> <span class="xg1 xw0">2017-2-3 11:36</span> </dt> <dd>看起来不错</dd> </dl><a name="comment_anchor_10651"></a> <dl id="comment_10651_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(10651, '5293');">引用</a> </span> <a href="http://club.oecr.com/space-uid-43934.html" class="xi2 xw1" c="1">myqf-ok</a> <span class="xg1 xw0">2017-2-3 11:06</span> </dt> <dd>呵呵。。。</dd> </dl></div> </div> <!--[diy=diycontentcomment]--><div id="diycontentcomment" 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