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      冬至節

      冬至日出時間和日落時間 日出日落的介紹

      時間:2018-12-19 17:50:57   作者:   來源:   閱讀:0   評論:0

          冬至日出時間和日落時間


          日出時間:07:33(北京時間),日落時間:16:53(北京時間)。


          冬至是北半球全年中白天最短、黑夜最長的一天,過了冬至,白天就會一天天變長。古人對冬至的說法是:陰極之至,陽氣始生,日南至,日短之至,日影長之至,故曰“冬至”。冬至過后,各地氣候都進入一個最寒冷的階段,也就是人們常說的“進九”,我國民間有“冷在三九,熱在三伏”的說法。


         日出時間


          日出的時間會隨季節及各地方緯度的不同而改變。傳統上認為在北半球,冬至時日出的時間最晚,然而事實上日出最晚的時間該是1月初。同一道理,日出最早的時間并非在夏至時,而是在6月中旬。即使在赤道地區,日出及日落的時間在全年里亦會有少量的變更。


          事實上,對于地球上除赤道與兩極及其附近的絕大部分地區,一年中日出最早的一天都在夏至之前,日落最晚的一天都在夏至之后,日落最早的一天都在冬至之前,日出最晚的一天都在冬至之后。你知道這是為什么嗎?


          首先,地球每時每刻都圍繞著太陽自西向東公轉。根據運動的相對性,我們從地球上也能觀測到太陽在一年當中圍繞天球黃道自西向東旋轉一圈。由于地球自轉軸的傾斜角,使得太陽在黃道上運行的大圓對地球的天球赤道是傾斜的,當太陽在兩個分點時,穿越赤道時會有一個角度的,所以平行于赤道的速度分量小于年平均速度;當太陽在至點時,它的運動方向是完全平行于赤道的,所以運行速度高于年平均速度。這會導致在春分、秋分前后,一天當中的白晝時段逐漸提前;夏至、冬至前后,一天當中的白晝時段逐漸推遲。


          其次,我們知道,地球的軌道是一個橢圓而不是正圓,太陽在地球軌道的一個焦點上。根據開普勒定律,當地球接近太陽時,速度會加快,到達近日點時的運動速度最快;遠離時又會減慢,到達遠日點時的速度最慢。而這個效應從太陽在天球赤道的周年運動軌跡當中也能夠反映出來。雖然第二個因素比第一個因素的影響要小一些,但是它也足以使北半球春分這一天的白晝時段,比秋分這一天整體推遲了約16分鐘。具體地說,就是假如某地春分6:19日出,18:19日落,則秋分6:03日出,18:03日落。


          日落時間


          日落的時間會隨著季節及各地方緯度的不同而改變。傳統上認為在北半球,冬至時日落的時間最早,日落最晚的時間在夏至時。但是實際上,由于黃赤交角與地球橢圓軌道的影響,日落最早的時間不會落在冬至,而是在12月初;日落最晚的時間也不會落在夏至,而是在6月底。即使在赤道地區,日出及日落的時間在全年里亦會有少量的變更。而這些變化可以用日行跡表達。


          日出及日落的時間可以跟蹤太陽的軌跡而計算得到。此外,太陽光會因為地球大氣層的影響而產生折射,所以在太陽降至低于地平線后仍可看到太陽,這是每天日落時產生的錯覺。


          眾所周知,一年之中日出、日落時間是不斷變化的。即使是在同一天當中,不同緯度的日出、日落時間也是不同的。那么為什么會導致這種效應呢?事實上,地球每時每刻都圍繞著太陽自東向西公轉。根據運動的相對性,我們從地球上也能觀測到太陽在一年當中圍繞天球黃道自西向東旋轉一圈。這自然會導致太陽的赤經與赤緯時時刻刻都會發生變化。并且不同季節,其變化的快慢也略有不同,這就導致了一年之中日出、日落時間是會隨季節不斷變化的。


          日出日落的時間最主要是跟著季節變動而變化的,夏天是北半球白天時間最長的,相對的冬天就是夜晚最長,這是地球的公轉造成的,也是季節變化最直接的體現。


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