i£2 Description and Use of the

PROBLEM XXVIII.

To find the sun’s declination, andthence the parallel of latitude cor-responding therewith, upon theterrestrial globe.

245. Find the fun’s place upon the broadpaper circle for any given day, art. 98. andseek that place in the ecliptic line upon theglobe ; this will strew the parallel of thefun’s declination among the dotted lines,which is also the corresponding parallel oflatitude; therefore all those places throughwhich this parallel passes, have the fun intheir zenith at noon on the given day.

PROBLEM XXIX.

To find those two days on whichthe fun will be vertical to any-place between the tropics.

246. That parallel of declination whichpasses through the given place, will cut theecliptic line upon the globe in two points,

which