The Ten Books on Architecture, 9.1.10

Vitruvius  translated by Joseph Gwilt

« Vitr. 9.1 | Vitr. 9.1 | Vitr. 9.2 | About This Work »

10Mars, on about the six hundred and eighty-third day, completes the circuit of the signs, and returns to his place; and if, in any sign, he move with a greater velocity, his stationary state in others equalizes the motion, so as to bring him round in the proper number of days. Jupiter moving also in contrary rotation, but with less velocity, takes three hundred and sixty days to pass through one sign; thus lengthening the duration of his circuit to eleven years and three hundred and twenty-three days before he returns to the sign in which he was seen twelve years before his setting out. Lastly, Saturn, remaining thirty-one months and some days in each sign, returns to his point of departure at the end of twenty-nine years, and about one hundred and sixty days, or nearly thirty years.Hence, the nearer he is to the extremity of the universe, the larger does his circuit appear, as well as the slower his motion.

« Vitr. 9.1 | Vitr. 9.1 | Vitr. 9.2 | About This Work »