Chapter 11: On the winds

2. There are four chief winds. The first of these is from the east, _Subsolanus_, and _Auster_ from the south, _Favonius_ from the west, and from _Septentrio_ (north) a wind of the same name blows. These winds have kindred winds one on each side.

3. _Subsolanus_ has on its right _Vulturnus_, on its left _Eurus_; _Auster_ has on its right _Euroauster_, on its left _Austroafricus_; _Favonius_ on its right _Africus_, on its left _Corus_. Further, _Septentrio_ has on its right _Circius_, on its left _Aquilo_. These twelve winds surround the globe of the universe with their blasts.

20. ... In the spring and autumn the greatest possible storms appear when it is neither full summer nor full winter, whence, as [the time] is an intervening one, bordering on both seasons, storms are caused from the conjunction of contrary airs.