Other Parts of the Northern Sky 201 



second century A.D., Arcturus has moved more than 

 i degree. 



In the winter months Arcturus will not be seen in 

 the early evening, but by the first of March it rises about 

 eight o'clock, corning into view a little earlier each suc- 

 ceeding night. During July and August it may be seen 

 early in the evening high in the southwest. 



The Northern Crown. This little constellation lies 

 20 degrees northeast of Arcturus. The Crown is open 

 toward the north. The brightest star in it is of the 

 second magnitude and is known as the Gem of the 

 Crown. This is a pretty constellation on a clear night. 



Problems for study. Which of the constellations 

 you have been studying remain above your horizon all 

 the time? How far in degrees from the north celestial 

 pole may a star be without passing below the horizon 

 as the earth rotates? Would you find it the same if 

 you were farther east or west on the earth, or farther 

 north or south? Do not become discouraged if you 

 find some of the questions difficult. Performing the 

 experiment indicated below will enable you to answer 

 some of them. 



If you have no globe so mounted that you can make 

 it rotate, push a long needle or stiff wire through an 

 apple or an orange. The equator will be an imaginary 

 circle midway between the two points where the needle 

 comes through. Mark on this globe a spot about as 

 many degrees north of the equator as you are north of 

 the earth's equator. Imagine a small ant to be on this 

 spot. Direct the axis (needle) toward the North Star 

 and, keeping it so directed, turn the globe or fruit 



