THE SKY. 



FIG. 11. TELESCOPIC APPEARANCE OS THE MOON. 



THE Sky is the familiar name used to express that won- 

 derful and vast expanse of space which extends on all sides 

 far beyond our knowledge or conception, and in which the 

 earth and millions of other orbs move round suns as their 

 centres. Countless millions of these suns exist at immense 

 distances apart and of the most prodigious magnitudes 

 (many thousand times larger than this earth), these are the 

 stars which on clear nights we see twinkling so brightly in 

 the sky ; our sun is one of them, but being very much nearer 

 to us than the others it appears proportionately larger and 



