日全食[riquanshi]
totalsolareclipse
totaleclipseoftheSun
所謂"食"就是指一個(gè)天體被另一個(gè)天體或其黑影全部或部分掩遮的天文景象。日食主要有日全食、日偏食及日環(huán)食三種。日食發(fā)生的原理是地球上的局部地區(qū)被月影所遮蓋而造成的。日食必發(fā)生在朔日,即農(nóng)歷的初一(朔)。這是因?yàn)橹挥性谀且惶,月亮才?huì)出現(xiàn)在太陽(yáng)與地球之間的連線上,這樣才有可能使月球擋住太陽(yáng)而形成日食。同樣地,月食一定出現(xiàn)在望日,即農(nóng)歷十五。
大家可能會(huì)問(wèn),為什么不是每個(gè)月的初一都會(huì)有日食,還有,為什么不是每個(gè)月的十五都會(huì)有月食呢?這是因?yàn)槌松厦娴臈l件外,影響日食和月食出現(xiàn)的還有其他一些因素。我們把地球圍繞太陽(yáng)公轉(zhuǎn)的軌道稱為黃道,把月球圍繞地球公轉(zhuǎn)的軌道稱為白道。黃道平面與白道平面不是相同的,它們之間平均有5°09′的夾角,并且隨時(shí)發(fā)生變化。只有當(dāng)月球運(yùn)行到黃道和白道的升交點(diǎn)和降交點(diǎn)附近時(shí),才會(huì)發(fā)生日食。
Theso-called"food"isacelestialbodythatwasanothercelestialbodyoritsHeiyingYanzheallorpartoftheastronomicalscene.RiQuansimainsolareclipse,thepartialeclipseandthreeontheEnvironmentandFood.TheprincipleisthesolareclipseoccurredonEarth,someareaswerecoveredbytheshadowcaused.ShuorisolareclipsewilloccurinthatfirstdayoftheLunarNewYear(NewMoon).Thisisbecauseonlyinthatday,themoonwillappearintheSunandtheconnectionbetweentheEarth,sowillitbepossibletoblockthesunandthemoonformedthesolareclipse.Similarly,theeclipsewillappearinWangrithattheLunarNewYear15。
Youmightask,whyisnotthefirstdayofeachmonthwillbeasolareclipse,whynotthe15thofeachmonthwillbeapenumbraleclipse?Thisisbecauseinadditiontotheaboveconditions,theimpactofthesolareclipseandtheeclipsethereareotherfactors.WetheEartharoundthesuntothetrackknownastheecliptic,themoonaroundtheEarthtothetrackknownastheWhiteRoad.Eclipticplaneandwhiteplane,notthesame,amongthemanaverageof5°09'angle,andalwayschanging.Onlywhenthemoontorun,andyelloworwhiteRoadintersectionneartheintersectionanddownonlywhenasolareclipse。
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