Eratosthenes asked himself how, at the same moment, a stick in Syene could cast no shadow and stick in Alexandria, far to the north, could cast a pronounced shadow.

• Eratosthenes心中不禁疑问著：同样都是夏至的时刻，在Syene城，棍棒完全不显出阴影，而在Syene北方的Alexandria城，却投射出非常显著的影子。