Mars, who was the Roman god of war, the corresponding Scandinavian god of war Tuya, leading to Tuesday; and for Venus, the Roman goddess of love and beauty, we have substituted the Scandinavian Freya, leading to Friday. Perhaps as I have mentioned these days of the week I may as well explain the curious order in which they come. The ancients did not know the distances of the planets away from us or from the Sun,

Fig. 43. but they could easily observe which of them moved most slowly and which most quickly. They put them in the order of speed, beginning with Saturn, the slowest, then Jupiter, Mars, the Sun, Venus, Mercury, and the Moon, which moves quickest of all (see Fig. 43). The old astrologers then assigned each planet influence for an hour; Saturn started with the first hour of his day, followed by Jupiter for the second hour, Mars for the third, and so on. When all seven planets had been used up, Saturn's turn came round again, and in the first 21 hours of the 24 all the planets