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根據小孔成像的原理,樹蔭下的光斑應該就是一個小太陽,日偏食的時候,光斑似乎也應該缺一塊. 實際上白天滿天都是亮的,樹蔭下的光斑並沒有明確的界線,所以在日偏食的時候,光斑是否就是有一處亮度偏暗的地方也沒有精確的界線.
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