ABSTRACT
SINCE I have introduced this discourse on the need to know about the winds, it is suitable to draw attention first to Isidore’s Bk XIII, which defines ‘wind’ as follows: Wind (ventus) is air disturbed and driven about, and is so called because it is boisterous (vehemens) and 31violent (violentus). 1 For the force of it is so great that it not only tears down rocks and trees, but also throws into commotion the sky and earth and stirs up the seas. 2 It receives different names in accordance with the various parts of the sky. The principal wind-flows are four in number, of which the first arrives from the east, and is called Subsolanus. From the south comes Auster; from the west Favonius; and from the north (Septentrio) blows the wind of the same name. Of these each has a pair of collateral winds, one on each side. Subsolanus has Vulturnus on its right, on its left Eurus; on the right of Auster is Euroauster, on its left Austro-africus; Favonius, which is also called Zephyrus, has Africus on its right, Corus on its left. Septentrio has on its right Circius and on its left Aquilo.
Definition of wind
There are four windflows Names of winds
Subdivision into 12 winds
