228 Description and Use of the

the hours from midnight, at 58 minutespast VIII in the morning, at which time nostars can be seen ; therefore we must haverecourse to the right ascension of the firstpoint of Libra, which is thus obtained,

h. min. sec.

To the right ascension of the first 1 npoint of Aries $ 20 5 8 -9

add ii 58 o

32 56 29

When the hours exceed 24, sub- ?tract therefrom \ 2 ^ 0 0

The right ascension of the first 1

point of Libra, A. D. 1770, > 8 56 29 in the,

May 8th, at J evening.

Now ift the precept to this problem, readLibra instead of the word Aries, and therule will hold good in this as well as in thefirst cafe. Therefore,

Bring the first point of Libra to the gra-duated side of the strong brass meridian, andset the horary index to 56 minutes past VIIIin the evening, turn the globe until the ho-rary index points to 10 minutes past Xo’clock, and you will find the star calledSpica Virginis, being that in the ear of cornshe holds in her hand, a star of the firstmagnitude marked <*, upon the meridian at

that