FIRST GRADE FALL WORK 39 



These tacks will show the successive weekly changes in the 

 length of the beam, and consequently the change in the 

 position of the sun at noon. 



In appealing to their experiences, get the pupils to see that 

 the days are growing shorter. When are the days the 

 shortest? When do we have the longest days? Compare 

 the length of the sun's path from sunrise to sunset in winter 

 and in summer, and show the connection between this and 

 the day's length. 



LESSON VII 

 THE SUN TEMPERATURE 



What part of the day is coolest ? Where is the sun then ? 

 What part of the day is warmest? Where is the sun then? 

 Why is it warmest near noon ? 



How do you hold your hands to the stove when they are 

 very cold and you wish to warm them? How does the heat 

 strike them in this position? How do we hold a handker- 

 chief or other similar article in drying it by the fire? Use 

 other illustrations until the relative effects of direct and 

 indirect rays are understood. 



A few examples from nature may aid in making this 

 thought clear. Which side of a house is warmest in winter? 

 Why? Which is warmer, a garden sloping downward to 

 the south or to the north ? Is the north or the south side of a 

 mountain the warmer ? Why is moss thicker on the north 

 side of a tree in the forest ? 



Where is the sun in the winter time? How do its rays 

 strike the earth in winter? Where is it in the summer? 

 How do its rays strike the earth in the summer time? Ex- 

 plain, then, why it is warm in summer and cold in winter. 



