Celestial and 'Terrestrial Globes. 157

the artificial sun to his place in the eclipticfor the given day of the month; and thenbring its center under the strong brass me-ridian, and set the horary index to that XIIwhich is most elevated.

Then bring the center of the artificial funto the eastern part of the broad paper circle,which in this cafe represents the horizon,and the horary index strews the time of the.fun-rising; turn the artificial fun to thewestern side, and the horary index will strewthe time of the fun-fetting.

Double the time of fun-rising is the lengthof the night, and the double of that of fun-fetting is the length of the day.

Thus on the 5th day of June, the funrises at 3 h. 40 min. and sets at 8 h. 20 m.by doubling each number it will appear,that the length of this day is 16 h. 40 nr.and that of the night 7 h. 20 nr.

The longest day at all places in northlatitude, is when the fun is in the first pointof Cancer. And,

The longest day to those in south lati-tude, is when the fun is in the first point ofCapricorn.

Wherefore