300 FERGUSON'S LECTURES. 



LECT. 

 Vni & ix. PROBLEM VIII. 



The hour of the day at any place being given, to find all 

 those places where it is noon at that time. 



Bring the given place to the brazen meridian, and set 

 the index to the given hour; this done, turn the globe 

 until the index points to the upper XII, and then, all the 

 places that lie under the brazen meridian have noon at 

 that time. 



N. B. The upper XII. always stands for noon ; and 

 when the bringing of any place to the brazen meridian 

 is mentioned, the side of that meridian on which the 

 degrees are reckoned from the equator is meant, unless 

 the contrary side be mentioned. 



PROBLEM IX. 



The hour of the day at any place being given, tojind what 

 o'clock it then is at any other place. 



Bring the given place to the brazen meridian, and set 

 the index to the given hour ; then turn the globe, until 

 the place where the hour is required comes to the meri- 

 dian, and the index will point out the hour at that 

 place. 



PROBLEM X. 



To Jind the sun's place in the ecliptic, and his declination* 1 

 for any given day of the year. 



Look on the horizon for the given day, and right 

 against it you have the degree of the sign in which 

 the sun is (or his place) on that day at noon. Find the 

 same degree of that sign in the ecliptic line upon the 

 globe, and having brought it to the brazen meridian, 



Note 81. The sun's declination is his distance from the equinoctial in 

 degrees, and is north or south, as the sun is between the equinoctial and 

 the north or south pole. Note by the Anthor. 



