HOW TO OBSERVE THE HEAVENS. 



and lines are drawn in various directions connecting the principal 

 stars, to show the student the manner of tracing the position of 

 those which he seeks, from those which he already knows. It is 



Fig. 6. 



assumed that he is already so familiar with the principal stars of 

 Ursa major and the pole star, that he can at once distinguish 

 them. Besides the connecting lines already mentioned, he will 

 see that the position of Algol can be ascertained by a straight line 

 drawn from the star -n of Ursa major, and continued to nearly an 

 158 





