In astronomy we have the Aurora Australis in the south and the Aurora Borealis in the north. According to [Wikipedia](http://en.wikipedia.org/wiki/Anemoi), *auster* is in fact the Latin equivalent of the Greek *νότος*, or southern wind. However, *boreas* is a Greek word, *βορέας*, not Latin! The Latin equivalent is *aquilo*. So, are the "southern lights" derived from a Latin word whereas the "northern lights" are derived from a Greek word? I can think of other places where *auster*/*boreas* are used as south/north. I find it unusual that this common pair would be derived from two different languages. How did this convention arise?