Now, instead of letting some one hold the ball between your head and the lamp, you must get some one to hold the ball farther off while you move _with your head between the lamp and the ball_. Place your head exactly between, so that its shadow covers the ball. Then you have a picture of a Moon-Eclipse. So once in a while, when the Earth goes exactly between Sun and Moon, the Moon for a very short time is not a bright world at all. She is quite a dull one. But the very moment she catches a glimpse of the Sun’s radiant face she begins to shine again. There is, you see, a great likeness, as well as some difference, between an Eclipse of the Sun and an Eclipse of the Moon. In an Eclipse of the Moon the Earth glides between Sun and Moon, and the Moon passes into the Earth’s shadow. In an Eclipse of the Sun, the Moon glides between Sun and Earth, and a part of our Earth passes into the Moon’s shadow. The Earth’s shadow is large, and the Moon’s shadow is small; yet so far the two kinds of Eclipse are really alike. If you and I were standing on the Sun we should see the Earth eclipse the Moon, and the Moon eclipse part of the Earth, by turns, and in the same way. The Earth would slip in front of the Moon, hiding the Moon from us; or the Moon would slip in front of the Earth, hiding part of the Earth from us. But looking upon the two sights from the Earth, and not from the Sun, they seem to us a little different in kind. Other Eclipses take place in the kingdom of the Sun besides these two. There are many other moons besides our Moon. You should always remember that MOON is the name of our particular moon, just as EARTH is the name of our particular world. Other little worlds travelling with big ones are spoken of as “moons;” but more rightly they ought to be called “satellites.” Each one has its own separate name; whereas _our_ “satellite” has no other name except “The Moon.” [Illustration: _At 10._] [Illustration: _At 10:15._] _Eclipse of the Moon. January 28, 1888._ Mars has two tiny moons, and Mars often eclipses his moons. Jupiter has five moons, and they often pass into his vast shadow. The eight moons of Saturn, the four moons of Uranus, the moon of Neptune, are all in turn eclipsed. Also, in turn, they all pass between the Sun and the Planet to which they belong, casting a small shadow on the Planet, and making an Eclipse of the Sun for that part where the shadow falls. One or two other things often seen are much like Eclipses, though known by other names. For instance, as the Moon journeys at night across the sky--_seems_ to journey, I mean--she blots out star after star on her way. Does she really blot each star out, as you might snuff out a candle? No, indeed. She only comes between our eyes and the star. The Moon is still as near as usual, and the star beyond is as far off as usual. But, for a little while, the Moon, being exactly in the line between, hides the star from us.