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1581年,一个名叫伽利略的意大利少年坐在教堂里观察正在摆动的吊灯。他用脉搏测量了吊灯摆动一个完整的来回所需要的时间。他测了一次又一次,感觉特别奇怪:吊灯无论摆动多远,它完成一个完整的来回所用的脉搏次数都是相同的!
In 1581, an Italian teenager named Galileo sat in the church watching the chandelier swinging. He measured the amount of time required for the pendulum to swing a complete roundabout with a pulse. He measured it again and again and found it strangely strange: the chandelier has the same number of pulses for a complete roundtrip, no matter how far it swings!