18 FIRST YEAR COURSE IN GENERAL SCIENCE 



6. Reasons for Studying Constellations. If we are 

 moving smoothly along in a train, it is sometimes necessary 

 to look at a stationary object in order to realize our own 

 motion. In the same Way, observation of stars which are 



NORTHERN HORIZON 



FIG. 3. THE NORTHERN SKY 



Copy or trace the diagram of the northern sky. Draw a line 

 through the Pointers and the North Star across the circle. Draw a 

 line at right angles to this line, also passing through the North Star. 



1. What group is in the same quarter as tho Big Dipper? 2. In 

 what quarter is Cassiopeia's Chair? 



stationary helps us to realize the motion of the earth. Many 

 stars are so much alike that it is difficult to find the same 

 star we observed a week or a month ago unless it forms a 

 part of some group of definite shape. When we have learned 



