Celejlial and ’Terrejlrial Globes. 143

over the globe, art. 218. and a line goingvertically upwards towards the fun from anyplace on the surface of the globe :

If to that place you apply the visible hori-zon, that point of it which a vertical line isnearest to at any time, thews the sun’s azi-muth at that time : and we must also ob-serve, that that point of the terrestrial orvisible horizon, to which a vertical line isnearest, is always the most elevated point.

233. Rectify the globe to the position ofa right sphere, art. 214. and apply the visi-ble horizon to London. When London isat the western edge of the broad paper cir-cle, which situation represents the timewhen the fun appears to rife, the easternpoint of the visible horizon being then mostelevated, shews that the fun at his rising isdue east.

Turn the globe till London comes to theeastern side of the paper circle, then thewestern point of the visible horizon will bemost elevated, and strew that the fun setsdue west.

If the globe be rectified into the positionof an oblique sphere, art. 215. and Londonbe brought to the eastern or western side os

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