8 The Earth's Size, Motions, and Seasons. 



1 1. The earth is larger than the moon, the 

 sun is larger than the earth, and some of the 

 stars are larger than the sun. 



(Here the teacher may draw on the black-board a circle 

 one inch in diameter to represent the moon ; another, four 

 inches in diameter to represent the earth; and for the sun,i 

 give them an idea of a ball 40 feet in diameter ; thus show- 

 ing their comparative size.) 



12. If you can imagine a rope stretched from the earth 

 to the sun, and 400 knots on it equally distant from each 

 other, the place of the moon would be at the knot nearest 

 the earth. 



13. The earth moves around the sun, and the 

 moon moves around the earth. 



(To explain these motions, one of the pupils may re- 

 present the sun, another walk around him to represent the 

 earth, and a third walk around the second, to represent 

 the moon.) 



14. If the earth did not move or revolve 

 around the sun, we should have no change of 

 seasons. Mention the seasons. What can you 

 say of winter ? Of spring ? Of summer ? Of 

 autumn ? 



1 5. The earth has another motion : it turns 

 around as a top spins, or as you might turn an 

 apple around on a knitting-needle. This kind 

 of turning is called rotation, and causes change 

 from day to night, and from night to day. 



SPELL AND DEFINE Sun, moon, circle, spring, 

 summer, autumn, winter, knot, knitting-needle. 



