# 赤纬

## 赤纬的变化

### 太阳

$\delta =-23.44^{\circ }\cdot \cos \left({\frac {360}{365}}\cdot \left(N+10\right)\right)$ 余弦中的角度的单位是角度

$\delta =-23.44^{\circ }\cdot \cos \left({\frac {2\pi }{365}}\cdot \left(N+10\right)\right)$ 余弦中的角度的单位是弧度

$N$ 是一年中的日数，1月1日的日数为1。
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