THE EARTH AS A PLANET 



185 



8. Let a sheet of paper, whose edge is cut out to fit down 

 over the sphere, be so adjusted perpendicular to the card- 

 board that it marks the 

 separation of the regions 

 of darkness and of illu- 

 mination when the sphere 

 is placed as in paragraph 

 2 above. Rotate the 

 sphere, and note the 

 relative lengths of the FIG. 82. June 21 st. 



paths through the daylight and nighttime regions for an 

 observer in the northern hemisphere. 



Do the same for the positions as given in paragraphs 3, 4, 

 5 above, and state what is apparently true of the relative 

 lengths of day and night for each of the different seasons. 



THE MOON, AND ITS PHENOMENA 



(a) Observations 1 



Let every one look for the moon to-night (or on the first clear night), 

 as early in the evening as possible, and be ready to help fill out the 

 following "Record" from which much concerning the moon and its 

 motions may be learned : 



etc.. etc. 



1 See footnote of lesson on Temperature Records. It is readily apparent, 

 too, that these studies are best begun when the moon is "new." 



