7.(Pg. [92]) Against what mistake must you guard respecting this line?
8.(Pg. [92]) What is meant by a plane, and how could one be represented?
9.(Pg. [93]) Describe what is intended by the plane of the earth's orbit.
10.(Pg. [93]) Extending this plane to the fixed stars, what circle would it form, and among what particular stars would it be found?
11.(Pg. [93]) What is [fig. 1. plate 9], designed to represent?
12.(Pg. [93]) The ecliptic does not properly belong to the earth, for what purpose then is it described on the terrestrial globe?
13.(Pg. [93]) What does the obliquity of the ecliptic to the equator serve to show?
14.(Pg. [93]) Within what limits do you find the torrid zone?
15.(Pg. [93]) What two zones are there between the torrid, and the two frigid zones?
16.(Pg. [93]) Where are the frigid zones situated?