只是天上的圆周率。。。(It’s just pi in the sky...)

新石器时代的人类建造这个建筑是为了庆祝圆周率日吗？不太可能。圆周率日是一个相对较新的现象——由一位物理学家在1988年发明，并在2009年被美国国会指定为全国性节日。但几乎可以肯定，这已经是庆祝数学常数最受欢迎的节日。虽然圆周率日是一个年轻的传统，但从古代开始，圆周率（Pi）本身就一直是一个令人着迷的数字，当时它最初被计算为一个圆的周长与直径之比。
原文：
Did Neolithic humans build this structure to celebrate Pi Day? Not likely. Pi Day is a relatively recent phenomenon – invented by a physicist in 1988 and designated by the US Congress a national holiday in 2009. But it's already almost certainly the most popular holiday celebrating a mathematical constant. While Pi Day is a young tradition, the number π (pi) itself has been a fascination since antiquity, when it was first calculated as the ratio of a circle's circumference to its diametre.
《© Guy Edwardes/Minden Pictures》