16. Can we see the Moon rise and set? Sometimes; not always. 17. Tell me one reason why we sometimes do not see the Moon. Sometimes she rises and gets at about the same time as the Sun; and then she is hidden by his brightness. 18. How do the Stars rise and set? Like the Sun and Moon, they rise in the east of the world and set in the west of the world. 19. Do all the Stars take the same journey? Some rise due east, some north-east, some south-east; and they set either due west, or north-west, or south-west. 20. Does every Star that we can see rise and set? No; many stars to the far north never rise nor set to us in England or the northern States, but circle round and round the pole-star. 21. How long a time does this journey take--either round the world or round the pole-star? Nearly twenty-four hours for each star. CHAPTER IV. HOW THE WORLD SPINS. In our last chapter we saw how the Sun rises and sets in the day, and how the Moon and Stars rise and set in the night. True, they also rise and set, by day as well as by night. The Moon often does so: and all day long there are Stars coming up in the east, and stars crossing the sky, and stars going down in the west. But we cannot see them. Until the great Sun has withdrawn his radiance the little star-gleams are hidden from us, and even the Moon can seldom be caught sight of. In the daytime, when you look up into the blue sky, and see a blaze of sunlight, you should sometimes remember that the stars are there. All day long, as well as all night long, the stars are there, shining just as usual. All day long, as well as all night long, they are moving steadily across our sky: rising, marching onward, and setting. We cannot see them; but that is because our eyes are weak, not because the stars themselves do not shine. So by day and by night the heavenly bodies seem to be ever on the move. No matter what part of the world you may be in--whether England or America, whether India or Australia--still you will find them moving. By day you will see the Sun rising in the east, journeying towards the west, and setting. By night you will see the Moon, and most of the stars, rising in the east, journeying towards the west and setting. This goes on continually. It is always the same. Year after year, there is no change. The Sun rises in one spot, crosses the sky, sets; and then a few hours afterwards rises again in very nearly the same spot as before, to cross the sky by very nearly the same path, and to set in almost exactly the same part of the western horizon. Each day there is a tiny, very tiny, difference; but by the end of twelve months the Sun gets back to exactly the same spot in rising and setting as in the previous year. And most of the stars follow the Sun’s example. Why should not one fix upon a bright star overhead, and hurry along on the ground, just as fast as the star goes, so as to keep it overhead longer--to keep it in sight?