But, in any case, even twelve regular moons of 291/2 days only make 354 days, whereas a solar year is about 3651/4 days, whilst the sun's time in passing through a "mansion" (one-twelfth of the solar year) is about 301/2 days. Thus there was a "superfluity" of about ten days in every lunar year, or about one lunation in every third year; not to mention that a "mansion" was about a day longer than a lunation, and that therefore the husbandman was liable to be thrown out of his reckoning. In order to remedy this, the Chinese intercalated a month once in about thirty-three moons, and called the intercalary month by the same name as the one preceding it, both with regard to the common numbers 1-12, and with regard to the two endless cycles of twelve signs and sixty signs, by which moons are calculated for ever, in the past and in the future. Regarding the difficulty of seasons, the solar year was divided into twenty-four "joints," and each "joint" was about half a "mansion" (the difference rarely exceeding one hour). However, the spring equinox is always the sixth "joint," and is the middle of spring season: this and the other "joints" being all about 151/4 days in length, the Chinese seasons can be symmetrically divided with relation to both equinoxes and both solstices; for the intercalary moon (judiciously made unobtrusive, and kept out of vulgar sight as far as possible) settles the lunar year difficulty; and the seasons conform, as of course they should do, to the heat of the sun, which is a much more natural and practical arrangement than our own arbitrarily assorted and unequal months.