Celefiial and ’Terrejlrial Globes. 153

which denote the sun’s place, against which,on the broad paper circle, are the days andmonths required.

PROBLEM XXX.

The day and hour at any placebeing given, to find where thefun is vertical at that time.

247. Let the given place be London, andtime the 1 ith day of May at 4 minutespast V in the afternoon.

Rectify the globe to the day of themonth, art. 219. and you have the fun’sdeclination 1 8 degrees north ; bring Londonto the meridian, and set the horary index toXII, turn the globe till the index points tothe given hour on the equator, 4 minutespast V, then Port-Royal in Jamaica will beunder the 18th degree of the strong brassmeridian, which is the place where the funis vertical at that instant.

PROBLEM