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轉軸傾角也可以等效的表示為行星的軌道平面和垂直於自轉軸的平面所夾的角度
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轉軸傾角也可以等效的表示為行星的軌道平面和垂直於自轉軸的平面所夾的角度
1.
轉軸傾角也可以等效的表示為行星的軌道平面 和垂直於自轉軸的平面所夾的角度。在太陽系, 地球的軌道平面就是黃道,所以地球的轉軸傾 角特別稱為黃赤交角,並以希臘字母的 ε (Epsilon)作為表示的符號。 目前,地球的轉軸傾角大約是 23.44° (23°26')。雖然在一整年之中轉軸傾角都朝 著相同的方向,但是因為地球繞著太陽運行, 因此原先朝向太陽的半球會逐漸改變成背離太 陽的半球,反之亦然。這種作用是造成季節變 化的主要原因(參考日照角對氣候的效應), 無論是那一個半球朝向太陽,那個半球每天的 日照時間就會比較長,並且陽光在正午時間觸 及地面的角度越接近垂直的方向,該地區在單 位面積內得到的能量也越多。 低傾斜度造成極區接受到的太陽輻射減少,使 得當地的環境有利於冰河作用。就像歲差和離
2.
心率的變化一樣,轉軸傾角的改變也會對季節 變化造成重大的影響,只是在大冰河期開始時, 轉軸傾角的週期對高緯度地區影響特別顯著[1] 。 傾角的變化是一個造成冰河期或間冰期起伏的 一個重要因素。(參見米蘭科維奇循環) 黃赤交角不是一個固定的值,會隨著時間而改 變。這種變化是很緩慢的,稱為章動,精確的 測量需要建立在每日數值變化的基礎上,而這 是天文學家的工作。 黃赤交角的變化和春分點 的歲差是以相同的理論來計算,並且有相互的 關連性。較小的 ε
意味著有較大的 p(黃經歲 差),反之亦然。實際上這兩種運動不僅是各 自獨立的,並且在相互垂直的方向上。
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