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同一时刻世界各地的时间是各不相同的,有的地方是白昼,有的地方是黑夜。大家一定知道这是由于地球自转造成的,那么,我们怎样才能证明地球的自转呢?现在我先给大家讲个小故事。1851年,法国的物理学家让·傅科在法国巴黎的国葬院放了一个巨大单摆装置,这个装置摆长为67米,摆锤是一个重达28公斤的铁球,铁球的底部镶了一根细细的长针。摆锤的下方是巨大的沙盘,每当摆锤经过沙盘上方的时候,摆锤上
At the same time, the time in different parts of the world is different. In some places it is daytime and in some places it is nighttime. We must know that this is caused by the rotation of the Earth. How can we prove the rotation of the Earth? Now let me tell you a little story. In 1851, the French physicist Jean · Foucault put a huge pendulum device in the burial ground in Paris, France. The device was 67 meters long and the pendulum was an iron ball weighing up to 28 kilograms. The bottom of the iron ball Inlaid with a thin long needle. Below the pendulum is a huge sand table, whenever the pendulum passes over the sand table, the pendulum