252 Description and Use of the

polar circle, and bring the artificial moon tothe east side of the horizon, she will befound to rise about the same time that thesun sets the evening after the autumnal fullmoon, which is about VI o’clock, at whichtime and place her amplitude will be about13 degrees.

In this position of the globe, if the artifi-cial moon be removed r 3 deg. 1 o min. uponthe ecliptic, which is her mean motiontherein for one dap, and so on for fourteennights together, she will be seen to rifewithin the space of one hour during thattime, which will be clear on observing thathalf the ecliptic rises at once.

It is remarkable that when the moon va-ries least in the time of her rising, the di-urnal differences are greatest at the times ofher setting.

What has been said with respect to northlatitudes is equally applicable to south lati-tudes.

In like manner the new moons in springrife nearly at the fame hour for severalnights successively, while the full moonsrile later by a greater difference than at a ' 7ether time of the year, because at this f.„