论文部分内容阅读
2004年雅典奥运会的开幕式,让我们领略了令人神往的古希腊文明.现在来看看在古希腊时期人们是怎样巧妙地测定地球周长的.从赫赫有名的亚历山大城(图中A点)沿着尼罗河向南5000希腊里(1希腊里≈158.5m),就到了另一个叫赛恩的城市(S点),赛恩城恰好处于北回归线上,在夏至日的正午,这里的太阳光真正是当头照,因此直射到了城里一口深井的底部.亚历山大城图书馆的馆长埃拉多塞(前275-前195)就选择这一天在亚历山大城竖直地立起了一根杆子.他根据杆在
The opening ceremony of the Athens 2004 Olympics gave us a glimpse of the fascinating civilization of ancient Greece. Now let’s take a look at how people measured the circumference of the Earth in an ancient Greek period. From the famous Alexander City (point A in the picture) ) Along the Nile River south of 5000 Greece (18.5km from Lieutenant of Greece), to another city called Sion (point S), Sion City happens to be in the Tropic of Cancer, at noon on the summer solstice, the sun here The light was really the headlight, so it shot directly to the bottom of a deep well in the city. The director of the Alexander City Library, Eradossé (prev.275--195) chose this day to erect a pole in the city of Alexandria. He is in accordance with the pole