284 Description andJJse of th

by its intersection on the parallel os theday, it thews the fun to be in the plane ofthe said parallel; which can never happen inthe morning on the eastern side of the globe,nor in the evening on the western side of it,but when the globe is rectified.

This rectification of the globe, is onlyplacing it in such a manner that the princi-pal great circles, and points, may concurand fall in with those of the heavens.

The many advantages arising from thesecapital problems relating to the placing ofthe globe in the fun’s rays, an intelligentreader will easily discern, and readily ex-tend to his own as well as to the benefit ofhis pupil.

PROBLEM LXIII.

To find when the planet Venus isa morning or an evening star.

322. Rectify the celestial globe to thelatitude and fun’s place, art. 189, 190. findthe place of Venus by an ephemeris, andset the artificial moon to that place in thezodiac, which will represent the planet;bring the artificial sun to the eastern edge

of