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<span>晝夜形成是因?yàn)槭裁丛蛞鸬?/span> </div> <div id="srbnjio" class="ar_con_nr"> <div id="mvjph9j" class="con_l fl"> <article class="ar_con bg louti"> <div id="x9qnw8x" class="ar_title"> <h1>晝夜形成是因?yàn)槭裁丛蛞鸬?/h1> <div id="8kpxmho" class="ar_title_b"> <div id="i3byhdq" class="sub_title clear"> <span id="mlirwo8" class="sp2 c6 fl">時(shí)間：<time class="fxtime">2017-08-16 17:07:27</time></span> <span id="e38hkuz" class="sp1 c6 fl"><em id="zuozhe" class="noshow">玉鳳</em><em class="user_id noshow">862</em>由 <em class="nickname"></em> 分享</span> <span id="4tgxola" class="fl arc_btn"></span> </div> </div> </div> <div id="we4etlq" class="y_ju"></div> <div id="3sb9zo9" class="con_article con_main" id="contentText"> <p>晝夜形成是因?yàn)槭裁丛蛞鸬?/p><p> 　　打架都知道白天和黑夜，晝夜之分，一般來說學(xué)習(xí)過地理的朋友都知道晝夜交替的原因。黑夜和晝夜是怎樣形成的呢？下面是學(xué)習(xí)啦小編整理的晝夜形成的原因，歡迎閱讀。</p><h2> 　　晝夜形成的原因</h2><p> 　　晝夜形成的原因是因?yàn)榈厍蚴且粋€(gè)不透明的幾何體造成的，太陽光只能到達(dá)一面，使其成為白天，另一面沒有接受到光的就是黑夜。至于地球自轉(zhuǎn)是晝夜更替的原因，而不是晝夜形成的原因。</p><p> 　　1、地球本身是一個(gè)不透明不發(fā)光的球體，</p><p> 　　2、太陽光在同一時(shí)間內(nèi)只能照到地球一般的表面積。</p><p> 　　3、地球的自傳。</p><p> 　　地球的自轉(zhuǎn)使地球一面朝著太陽，一面背著太陽。</p><h2> 　　交替晝夜的原因</h2><p> 　　日常生活中24小時(shí)的晝夜交替，緣于地球的自轉(zhuǎn)(如果地球沒有自轉(zhuǎn)，只有公轉(zhuǎn)，也會(huì)有晝夜的交替，但周期不是24小時(shí))。直覺告訴人們，太陽的東升西落使地球有晝夜之分。其實(shí)，晝夜產(chǎn)生的原因是地球在不停地自轉(zhuǎn)。由于我們也在隨著地球轉(zhuǎn)動(dòng)，因此并不感覺地球在運(yùn)動(dòng)，相反，看到太陽有東升西落的運(yùn)動(dòng)。教材中“自東方迎來黎明的曙光，由西方送走黃昏的落日”，是人們看到的太陽的運(yùn)動(dòng)，反映的是地球自西向東的自轉(zhuǎn)。</p><h2> 　　晝夜交替的周期</h2><p> 　　晝夜交替的周期為24小時(shí)，一個(gè)太陽日。記住不是恒星日。恒星日是地球自轉(zhuǎn)一周實(shí)際所需的時(shí)間，或春分點(diǎn)兩次經(jīng)過同一子午圈所需的時(shí)間，也就是某一個(gè)恒星兩次經(jīng)過同一子午線所需的時(shí)間。一個(gè)恒星日等于23小時(shí)56分4秒。在天文學(xué)上，定義恒星日的不是具體的恒星，而是黃道對(duì)于天赤道的升交點(diǎn)，即白羊?qū)m第一點(diǎn)，就是北半球的春分點(diǎn)。但是春分點(diǎn)在不斷的西移(歲差)，所以天文學(xué)上的恒星日與地球的自轉(zhuǎn)周期還是有區(qū)別的</p><h2> 　　晝夜交替詳述</h2><p> 　　晝夜交替任一瞬間，地球各地所處的晝夜?fàn)顟B(tài)可以用太陽高度來表達(dá).太陽高度是太陽高度角的簡稱，表示太陽光線對(duì)當(dāng)?shù)氐仄矫娴膬A角.在晝半球上的各地，太陽高度總是大于0度，即太陽在地平線之上;在晨昏線上的各地，太陽高度等于2度，即太陽剛好位于地平線上;在夜半球上的各地，太陽高度總是小于0度，即太陽位于地平線之下.由于地球不停地運(yùn)動(dòng)，晝夜也就不斷地交替.晝夜交替的周期，或太陽高度的日變化周期為24小時(shí)，叫做一太陽日.太陽日制約著人類的起居作息，因而被用來作為基本的時(shí)間單位.此外，太陽日時(shí)間不長，使整個(gè)地球表面增熱和冷卻不致過分劇烈，從而保證了地球上生命有機(jī)體的生存和發(fā)展.</p><p> 　　由于地球的自轉(zhuǎn)地球不同位置同一時(shí)刻的晝夜情況是不一樣的,有的是正午,有的是子夜,有的正經(jīng)歷晝夜交替的早晨或傍晚.當(dāng)某地太陽升起到一天中最高位置時(shí),太陽只射在該地所處的經(jīng)線上,這時(shí)就是當(dāng)?shù)氐恼?這樣確定的時(shí)間叫做地方時(shí)(local time).經(jīng)度每相差15度.地方時(shí)相差1小時(shí).</p><p> 　　由于地軸是傾斜的,所以地球上不同地區(qū)的晝夜長短是不同的。在地球的南北兩極地區(qū)，太陽終年斜射，晝夜長短變化最大。南北半球的高緯度地區(qū)還會(huì)出現(xiàn)太陽終日不落或終日不出的現(xiàn)象，即一天24小時(shí)都是白天或者都是黑夜，這就是極地地區(qū)的"極晝"和"極夜"現(xiàn)象。在南北極點(diǎn)，有長達(dá)半年的極晝和極夜。</p><p> 　　對(duì)于晝夜交替現(xiàn)象的發(fā)現(xiàn),取決于哥白尼(Nicolaus Copernicus1473~1543)的日心說:地球饒著太陽公轉(zhuǎn),同時(shí)也在自轉(zhuǎn),這就是一個(gè)對(duì)晝夜交替現(xiàn)象的合理解釋.提出日心說后300年,一名叫傅科(Foucault，Jean-Bernard-Lon1819~1868)的科學(xué)家發(fā)現(xiàn)了擺的運(yùn)動(dòng)規(guī)律,給日心說提供了有力的證據(jù).</p><h2> 　　晝夜時(shí)差的算法</h2><p> 　　【A-B】/15=C-----D * 4東經(jīng)為正數(shù)，西經(jīng)為負(fù)數(shù)，兩地所在經(jīng)度大減小，所得差除以15，整數(shù)C為小時(shí)，余數(shù)D每度乘以4為分鐘。二，地方時(shí)：“東加西減”。在原地的東面加，在西面減。三，日期如果跨越了和180°經(jīng)線幾乎重合的國際日期變更線，向東去日期減一天，向西則加一天</p><hr /><p> 猜你感興趣：</p><p> 1.<a _href="http://lpo831.com/yuanyin/227127.html" href="http://lpo831.com/yuanyin/227127.html" target="_blank">晝夜長短的變化的原因</a></p><p> 2.<a _href="http://lpo831.com/xuexifangfa/chuyidili/713032.html" href="http://lpo831.com/xuexifangfa/chuyidili/713032.html" target="_blank">初中地理七年級(jí)上冊(cè)第一章教案</a></p><p> 3.<a _href="http://lpo831.com/yuanyin/1405876.html" href="http://lpo831.com/yuanyin/1405876.html" target="_blank">小孩不睡覺是什么原因引起的</a></p> </div> <div id="hi7sp83" class="y_ju"></div> <div id="lp8rox8" class="pnum"> <ul 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