[ ] 
as alfo in Places near the Equator. But the chief 
Ad'^antage gained by this Alteration, is, that the 
Globe is now adapted for folving of Problems upon 
the Principles of the Pythagorean Syftem, or to fhew 
how the Viciffitudes of Days and Nights, and the 
Alterations of their Lengths, are really made by the 
Motions of the Earth. To expedite this, I had the 
Brafs Meridian at one of the Poles divided into 
Months and Days, according to the Sun’s Declina- 
tion, reckoning from the Pole. This being done, 
if we bring the Day of the Month to the Horizon, 
and redify the Globe according to the Time of the 
Day, the Horizon will reprefent the Circle feparating 
Light and Darknefs, and the upper Half of the Globe, 
the illuminated Hemifphere, the Sun being in the 
Zenith. 
While, we view the Globe in this Pofition, we 
fee the Situations of all Places in the illuminated 
Hemifphere, with refped to the Horizon, Meridian, 
^c. and by obferving the Angles which the Meri- 
dians, cutting any Parallels of Latitude in the Ho- 
rizon, make with the Brafs Meridian, we have the 
Semidiurnal Arches of thefe Parallels refpedively : 
And at the fame time (if the Sun be not in the 
Equator) we fee why the Diurnal Arches of the 
Parallels continually decreafe from the Neighbour- 
hood of the elevated Pole, till we come to the 
oppofite Part of the Horizon. If we turn the Globe 
Eaftcrly round its Axis, we fhall fee how all Places 
change their Pofitions with refped to the general 
Horizon, the Meridian, by the Motion of the 
Earth round her Axis. 
It 
