‹‹‹ Vitr. 9.3.2 | Table of Contents | Vitr. 9.4.1 ›››
3When the sun enters into Scorpio at the setting of the Pleiades, he diminishes, in passing to the southern parts, the length of the days; and from Scorpio passing to a point near the thighs of Sagittarius, he makes a shorter diurnal circuit. Then beginning from the thighs of Sagittarius, which are in Capricornus, at the eighth part of the latter he makes the shortest course in the heavens. This time from the shortness of the days, is called Bruma (winter) and the days Brumales. From Capricornus passing into Aquarius, the length of the days is increased to that of those when he was in Sagittarius. From Aquarius he passes into Pisces at the time that the west wind blows; and his course is equal to that he made in Scorpio. Thus the sun travelling through these signs at stated times, increases and diminishes the duration of the days and hours. I shall now treat of the other constellations on the right and left of the zodiac, as well those on the south as on the north side of the heavens.
3When the sun has entered Scorpio, at the time of the setting of the Pleiades, he begins to make the days shorter as he advances toward the south. From Scorpio he enters Sagittarius and, on reaching the thighs, his daily course is still further diminished. From the thighs of Sagittarius, which are reckoned as part of Capricornus, he reaches the end of the first eighth of the latter, where his course in heaven is shortest. Consequently, this season, from the shortness of the day, is called bruma or dies brumales. Crossing from Capricornus into Aquarius, he causes the days to increase to the length which they had when he was in Sagittarius. From Aquarius he enters Pisces at the time when Favonius begins to blow, and here his course is the same as in Scorpio. In this way the sun passes round through the signs, lengthening or shortening the days and hours at definite seasons.
I shall next speak of the other constellations formed by arrangements of stars, and lying to the right and left of the belt of the signs, in the southern and northern portions of the firmament.