circumference of the earth
is two hundred and fifty-two thousand stadia, that is, thirty-one[28] one million five hundred thousand paces, and observing that an eighth part of this, occupied by a wind, is three million nine hundred and thirty-seven thousand five hundred paces, they should not be surprised to find that a single wind, ranging over so wide a field, is subject to shifts this way and that, leading to a variety of breezes. (Vitruvius, 15BCE)