The stadion (plural stadia, Ancient Greek: στάδιον; latinized as stadium; also anglicized as stade), was an ancient Greek unit of length, consisting of 600 Ancient Greek feet (podes). There are a range of varieties or understandings of what a stadion was and is; these have been calculated by various historians (of various qualities), and those calculations have varied dramatically (as did perhaps the use and meaning of the term stadion over time in Ancient Greece). Thus, the exact length of one stadion is not known or universally agreed today: historians estimate it at between 150 and 210 m (490 and 690 ft), with perhaps something of a convergence around the 185 metres (607 ft) length of an Attic stade.
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Stade (unit) in the context of Pous
The pous (pl. podes; Ancient Greek: πούς, poús) or Greek foot (pl. feet) was a Greek unit of length of approximately 300mm or 12 inches. It had various subdivisions whose lengths varied by place and over time. 100 podes made up one plethron, 600 podes made up a stade (the Greek furlong) and 5000 made up a milion (the Greek mile). The Greek pous also has long, median and short forms.
The pous spread throughout much of Europe and the Middle East during the Hellenic period preceding and following the conquests of Alexander the Great and remained in use as a Byzantine unit until the Fall of Constantinople in 1453.
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