斯塔迪翁
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定义
古希腊长度单位，约等于185米（600希腊英尺），最初定义为赛跑跑道的长度。
解释
The word 'stadium' derives directly from this unit, as Greek athletic facilities were built to accommodate one stadion of racing distance. Eratosthenes famously used the stadion around 240 BC to estimate Earth's circumference at approximately 250,000 stadia — yielding a result within ~2% of the modern value, depending on which regional stadion he used. The exact length varied between Greek city-states, ranging from 157 m to 211 m.
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