THE HEAVENS 197 



light from the nearer stars to reach the earth, and the time 

 from the more distant stars. * 



(g) The two motions of the moon as the earth moves on 

 around the sun in its path of revolution. The meaning of 

 the term satellite as applied to the moon. 



(ti) The relative intensity (degree) of heat and light from 

 the sun upon Mercury, Earth, Neptune. 



(i) The length of the years for the different planets, i.e., 

 their periods of revolution around the sun. 



