38 OUR PHYSICAL WORLD 



zodiacal constellation, the Virgin (Fig. 23), is readily located by 

 its first-magnitude star Spica. This star, Denebola, and Arcturus 

 form an equilateral triangle. Arcturus we have learned to find 

 by extending the handle of the Dipper. 



FIG. 23. Virgo, the Virgin 



Libra, the Scales, is 'a group of low-magnitude stars that 

 originally formed a part of the Scorpion, the next constellation 

 in the zodiac that is marked by a first-magnitude star, Antares. 

 It is still low down in the southeast at 9:00 P.M. the last of May. 

 A line drawn through the pointer in the Dipper that is farthest 

 from the Pole and the star in the outer end of the handle leads 



