Aulus Gellius, Attic Nights
John C. Rolfe, Ed.

Then Favorinus ran on as follows: “It is well known,” said he, " that there are four quarters and regions of the heavens—east, west, south and north. East and west are movable and variable points; ¹ south and north are permanently fixed and unalterable. For the sun does not always rise in exactly the same place, but its rising is called either equinoctial when it runs the course which is called ἰσημερινός (with equal days and nights), or solsticial, which is equivalent to θεριναὶ τροπαί (summer turnings), or brumal, which is the same as χειμεριναὶ τροπαί, or 'winter turnings.' So too the sun does not always set in the same place; for in the same way its setting is called equinoctial, solstitial, or brumal. Therefore the wind which blows from the sun's spring, or equinoctial, rising is called eurus, a word derived, as your etymologists say, from the Greek which means ' that which flows from the east.' This wind is called by the Greeks by still another name, ἀφηλιώτης, or 'in the direction of the sun'; and by the Roman sailors, subsolanus (lying beneath the sun). But the wind that comes from the summer and solstitial point of rising ² is called in Latin aquilo, in Greek βορέας, and some say it was for that reason that Homer called ³ it αἰθρηγενέτης, or 'ether-born' ⁴ ; but boreas, they think, is so named ἀπὸ τῆς βοῆς, 'from the loud shout,' since its blast is violent and noisy. To the third wind, which blows from the point of the winter rising—the Romans call it volturnus—many of the Greeks give a compound name, εὐρόνοτος, because it is between eurus and notus. These