The length of the day is equal to our lunar month, for all that time is included in one revolution round her axis. Her days and nights, therefore, will constantly be of the same length, or almost fifteen of our days each. The year will be exactly the same with our year; because, being an attendant on the earth, she must go round the sun in the same time as that does. Her difference of seasons will be much less than on our earth, having only a small inclination of her axis of six degrees and a half; so that the variation between her summer’s heat and her winter’s cold must be comparatively inconsiderable. Hence there will be only thirteen degrees of Torrid Zone, on some parts most opposite the sun, and thirteen degrees of Frigid Zone on those contiguous to her poles; which consequently must leave seventy-seven degrees for what we should call her Temperate Zones, both in the north and south parts from her Equator. Our earth, unquestionably, performs the office of a moon to the moon, waxing and waning regularly, but appearing thirteen times as large, and, of course, affording her thirteen times as much light as she does to us. When she changes to us, the earth appears full to her; when she is in her first quarter to us, the earth is in its third quarter to her; and _vice versâ_. To the moon the earth seems to be the largest body in the universe, and must indeed be a most magnificent sight. On the supposition that the moon is inhabited, it may be observed, that those who are placed about the middle of the surface, or face next to us, will constantly see our earth over their heads, and increasing and decreasing in light, like as the moon itself appears to us. Those who are situated near the borders, whether on the right or left, or upon the top or bottom, will also constantly have the same appearance in the opposite part of the horizon. But those who live on the side of the moon which is not presented to us, will know nothing of our earth, or at least, they will never have an opportunity of seeing this large and wonderful moon, without travelling perhaps more than 1,500 of our miles on the surface of that luminary. To those who live on this side of the moon, or travel to it on any account, as we may pass from the northern into the southern hemisphere of our globe, the earth, indeed, when at full to them, will appear to be more than three times as broad as the moon does to us, and to communicate, as has been already mentioned, about thirteen times as much light to her, as she does to us when at the full.