The Ten Books on Architecture, 1.6.11

Vitruvius  translated by Joseph Gwilt

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11There are also the morning breezes, which the sun rising from his subterranean regions, and acting violently on the humidity of the air collected during the night, extracts from the morning vapours. These remain after sunrise, and are classed among the east winds, and hence receive the name of εὐρος given by the Greeks to that wind, so also from the morning breezes they called the morrow αὔριον. Some deny that Eratosthenes was correct in his measure of the earth, whether with propriety or otherwise, is of no consequence in tracing the regions whence the winds blow:

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