47.(Pg. [99]) How much is the axis of the earth inclined, and with what line does it form this angle?
48.(Pg. [99]) What is represented by [fig. 2, plate 9]?
49.(Pg. [100]) How is the north pole inclined in the middle of our summer, and what effect has this on the north frigid zone?
50.(Pg. [100]) In what direction does the north pole always point?
51.(Pg. [100]) What is shown by the position of the earth at B, in the figure?
52.(Pg. [100]) How does the sun then shine at the poles, and what is the effect on the days and nights?
53.(Pg. [101]) When the earth has passed the autumnal equinox, what changes take place at the poles, and also in the whole northern and southern hemispheres?
54.(Pg. [101]) Why is the heat greatest within the torrid zone?
55.(Pg. [101]) How does the sun appear at the poles, during the period of day there?
56.(Pg. [101]) In what will the days and nights differ in the temperate zone, from those at the poles, and at the equator?