Sol autem signi spatium, quod est duodecuma pars mundi, mense vertente vadens transit; ita xii mensibus xii signorum intervalla pervagando cum redit ad id signum, unde coeperit, perficit spatium vertentis anni.
The sun, journeying for a month, passes over the space of a sign which is the twelfth part of the heavens. Thus in twelve months he traverses the distance of twelve signs, and when he returns to the sign from which he started, he completes the space of the revolving year.
final_alignments\Vitruvius_Architecture_Book_9.json