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具體的計算過程涉及很多立體幾何,我不方便都寫進來,大概思路是用日期計算太陽直射點緯度或者太陽直射方向與赤道面所成的角,用這個角度計算晝夜分界線與觀察點所在地緯度小圓的交點,用交點計算小圓上的夜弧(或晝弧)…
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