172 



EARTH AND HEAVENLY BODIES 



earth's atmosphere. These fragments are usually con- 

 sumed by the heat. 



nebula a cloud-like object in the distant celestial spaces 

 that glows from it own light. 



satellite or moon a body revolving about a planet. 



one of the northern skies and the other of the southern 

 skies. 



Select the maps for the month in which you are observing 

 and locate on the map the particular constellation which 

 you wish to find in the heavens. Get an idea of the general 

 position of the constellation, that is, its distance above the 



\ /VEGA 



, ~~*"/ 



,CEPHEUS/ W LYRA V >* 



-'V D*^ \ 



CEPHEUS 

 CASTOR CHARIOTEER 



i-'fom The Science Classroom. Courtesy of Popular Science Publishing Co. 



FIG. 285fi. STAR MAPS 



INVESTIGATIONS WHICH WILL HELP ANSWER 

 THE PROBLEM QUESTIONS 



Activity 117. How are the star maps used in locating 

 the constellations? 



Each star map in Figure 285 is drawn to represent the 

 heavens for a given month of the year. Examine these maps 

 and observe that there are two diagrams for each month, 



horizon and its location to the east or west of a line drawn 

 from the top of the star map to the bottom. Also get in 

 your mind as clear a picture as you can of the shape of the 

 constellation. If t'le star group is found on the map of the 

 northern skies, face north, and if on the other map, face 

 south. If possible, have your star map before you and illum- 

 inate it with a flashlight from time to time to check your 

 observations. 



