THE USE OF THE TERRESTRIAL GLOBE. 315 



real earth, rising to some when he is setting to others ; LECT* 

 as you may perceive by that part where the enlightened Vin.&lX. 

 half of the globe is divided from the half in the shade, 

 by the boundary of the light and darkness ; all those 

 places, on which the sun shines, at any time, having 

 day ; and all those, on which he does not shine, having 

 night. 



If a narrow slip of paper be put round the equator, 

 and divided into 24 equal parts, beginning at the meri- 

 dian of your place, and the hours be set to those divi- 

 sions in such a manner, that one of the VI's may be 

 upon your meridian ; the sun being upon that meridian 

 at noon, will then shine exactly to the two XII's ; and 

 at one o'clock to the two I's, &c. So that the place, 

 where the enlightened half of the globe is parted from 

 the shaded half, in this circle of hours, will shew the 

 hour of the day. 



The principles of dialing shall be explained farther 

 on, by the terrestrial globe. At present we shall only 

 add the following observations upon it ; and then pro- 

 ceed to the use of the celestial globe. 



1. The latitude of any place is equal to the elevation 

 of the pole above the horizon of that place, and the ele- 

 vation of the equator is equal to the complement of the 

 latitude, that is, to what the latitude wants of ninety de- 

 grees. 



2. Those places which lie on the equator have no la- 

 titude, it being there that the latitude begins ; and those 

 places which lie on the first meridian have no longitude, 

 it being there that the longitude begins. Consequently, 

 that particular place of the earth where the first meri- 

 dian intersects the equator, has neither longitude nor 

 latitude. 



3. In all places of the earth, except the poles, all 

 the points of the compass may be distinguished in the 

 horizon : but from the north pole, every place is south ; 



