260 Astronomy. [Lecture 17. 



equal parts, which are each thirty degrees, they 

 have assigned a mark to each of these distances, 

 and they have given to it the name of the con- 

 stellation which it contained. The first of these 

 signs begins always at the point of intersection 

 of the ecliptic with the equator, in which the Sun 

 is found at the vernal equinox. 



The twenty-one constellations enumerated by 

 Ptolemy in the northern part of the heavens are, 



Ursa minor, the little bear. 



Ursa major, the great bear. 



Draco, the dragon. 



Cepheus. 



Bootes. 



Corona Borealis, the northern crown. 



Hercules, Hercules kneeling. 



Lyra, the harp. 



Cygnus, the swan. 



Cassiopeia, the lady in her chair. 



Perseus. 



Auriga, the waggoner. 



Serpentarius, 



Serpens, the serpent. 



Sagitta, the arrow. 



Aquila, the eagle. 



Delphinus, the dolphin. 



Equulus, the horse's head. 



Pegasus, the flying horse. 



Andromeda. 



Triangulum, the triangle. 

 The fifteen constellations described by Ptole- 



