黃道
黃道，也叫日道，是從地球浪朝天浪望，太陽勒一年裏向，勒天球浪跑過個軌蹟。黃道搭地球自轉弗搭界。講清爽點，就是地球繞牢太陽轉，箇隻平均軌蹟平面，搭天球個交界線。
因為地球自轉軸搭公轉平面弗垂直，所以赤道平面搭黃道平面弗平行，俚篤當中夾仔23°27'個角度，所以造成功地軸笡過來。兩隻平面個交線就連牢春分搭秋分。地球浪望過去，太陽朝南變朝北，就叫春分。從該個場化朝東數一圈，0°到360°，就是黃道經綫，寫做λ，角度叫黃經幾化度。黃道緯綫就是南北正負各90°，寫做β，角度叫黃緯幾化度。地球公转速度的变化产生了均时差。
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