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88天:【小牛顿-人文历史】探访“时间”的奥秘(中)
Episode 12

88天:【小牛顿-人文历史】探访“时间”的奥秘(中)

【小牛顿】科学开讲咯(6-12岁) · 小牛顿

April 2, 20165m 41s

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Show Notes

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最初的计时工具叫日晷,是一块刻有刻度的长方形图板,上面插着一根竹竿,当太阳照射时看竹竿的影子落在何处,就可以知道是甚么时刻了。