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In page Pytheas:

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Pytheas did use the word "whole" and he stated a perimetros ("perimeter") for Britain of more than 40,000 stadia. Using Herodotus' standard of 600 feet (180 m) for one stadium gives 4,545 miles (7,314 km); however, there is no way to tell which standard foot was in effect. The English foot is an approximation. Strabo wanted to discredit Pytheas on the grounds that 40,000 stadia is outrageously high and cannot be real.[citation needed]