29(5 FERGUSON'S LECTURES. 



LECT. greatest longitude is 180 degrees, because no place is 

 : more than 180 degrees from the first meridian. 



PROBLEM V. 



To find tiie antoeci, 76 periceci, 73 and antipodes,* of any 

 given place. 



Bring the given place to the brazen meridian, and 

 having found its latitude, keep the globe in that situa- 

 tion, and count the same number of degrees of latitude 

 from the equator towards the contrary pole, and where 

 the reckoning ends, you have the antaci of the given 

 place upon the globe. Those who live at the equator 

 have no antaci. 



Nate 78. The antccei are those people who live on the same meri- 

 dian, and in equal latitudes, on different sides of the equator. Being 

 on the same meridian, they have the same hours ; that is, when it is 

 noon to the one, it is also noon to the other ; and when it is midnight 

 to the one, it is also midnight to the other, &c. Being on different 

 sides of the equator, they have different or opposite seasons at the 

 same time ; the length of any day to the one is equal to the length of 

 the night of that day to the other ; and they have equal elevations of 

 the different poles. Note by the Author. 



Note 79. The periaeci are those people who live on the same pa- 

 rallel of latitude, but on opposite meridians : so that though their lati- 

 tude he the same, their longitude differs 180 degrees. By being in 

 the same latitude, they have equal elevations of the same pole (for the 

 elevation of the pole is always equal to the latitude of the place) the 

 same length of days or nights, .and the same seasons. But being on 

 opposite meridians, when it is noon to the one, it is midnight to the 

 other. Ibid. 



Nate 80. The antipodes are those who live diametrically opposite 

 to one another upon the globe, standing with feet towards feet, on 

 opposite meridians and parallels. Being on opposite sides of the 

 equator, they have opposite seasons, winter to one, when it is summer 

 to the other ; being equally distant from the equator, they have the 

 contrary poles equally elevated above the horizon ; being on opposite 

 meridians, when it is noon to the one, it must be midnight to the other; 

 and as the sun recedes from the one when he approaches to the other, 

 the length of the day to the one must be equal to the length of the 

 night at the same time to the other. Ibid. 



