This sentence means that by observing the shadows of objects (like under a hall), one can infer the movement of the sun.
这句话的意思是，通过观察物体（如堂下）的阴影，可以推断出太阳的运行轨迹。
| Front | 故审堂下之阴，而知日月之行 |
|---|---|
| Back | 阴影，树荫 |
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