形成過程
每年夏至日(6月22日左右)這一天這裡能受到太陽光的垂直照射。然後太陽直射點向南移動。北半球北回歸線以南至南回歸線的區域每年太陽直射兩次,獲得的熱量最多,形成為熱帶。因此北回歸線是熱帶和北溫帶的分界線。
(Tropic of Cancer),即北緯23°26′緯線。這是太陽光直射在地球上最北的界線。
每年夏至日(6月22日左右)這一天這裡能受到太陽光的垂直照射。然後太陽直射點向南移動。北半球北回歸線以南至南回歸線的區域每年太陽直射兩次,獲得的熱量最多,形成為熱帶。因此北回歸線是熱帶和北溫帶的分界線。
(Tropic of Cancer),即北緯23°26′緯線。這是太陽光直射在地球上最北的界線。
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