Teacher's Leaflet. 



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(d) When just opposite the lamp it shows its whole face lighted turned toward 

 the earth. 



(e) Another quarter around shows a half disc, which is the third quarter. 



(f) When almost between the sun and the earth the crescent of the old moon 

 appears. 



(g) Note the moon always keeps one face toward the earth. 



(h) Note that the new moon crescent is the lighted edge of one side of the 

 moon, while the old moon crescent is the lighted edge of the opposite side. 



(i) Make an eclipse of the moon by letting the shadow of the earth fall upon it, 

 and an eclipse of the sun by revolving the moon apple between the sun and the 

 earth. The earth's orbit and the moon's orbit are such that this relative position 

 of the two bodies occurs but seldom. 



After the above experiment give the pupils the questions of Lesson XXIII. In 

 studying the rising and setting of the moon begin with the full moon which rises 

 at sunset and sets at sunrise ; the moon rises in the east about fifty minutes later 

 each consecutive evening. This time varies in different phases of the moon, as 

 can be observed by studying any almanac. Finally it rises in the morning and 

 during the last quarter we see the old moon reflecting light from what is to us the 

 morning sun. The moon always keeps one face toward us, and as it is a globe 

 in the space of our solar system with no fires or light of its own it is always half 

 in light and half in darkness excepting when in eclipse. However, our earth also 

 shines by reflected light, and is almost four times the diameter of our moon. 

 Think what a .'splendid moon our earth must be and how bright the moonlight it 

 gives off ! So when we see the old moon in the new moon's arms, that is, the dark 



Photo after NasmytK 



The moon's surface seen through a telescope, showing the craters Mercator and Cam- 

 f>anus. Note that the shadows give some idea of their height. 



