92 



GENERAL SCIENCE 



SUNSET SUNSET 





SUNRISE 



E 



FIG. 71. The daily course of the sun at the time of the solstices and the 



equinoxes. 





FIG. 72. The rays A B strike the earth vertically the" rays CD strike in a 

 slanting direction. As D C is longer than A B, the same number of rays 

 are spread over a greater surface and give -less heat. 



