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今天,大部分中学生甚至小学生都知道,地球的周长大约是4万公里。似乎这是一个非常简单的、毋庸置疑的问题。但是,你们想过没有,是谁第一个测出地球周长的?在那个科技落后的时代,他又是如何巧妙地计算的?
Today, most middle school students and even elementary school students know that the circumference of the Earth is about 40,000 kilometers. It seems that this is a very simple and unquestionable question. However, did you think about it, who was the first to measure the circumference of the earth, and how did he skillfully calculate it in the era of backward technology?