336 Description and Use of theExample II.

Given, 26° 30', the quantity of the pre-cession to find the time

26° 30'

Multiply by 60

1590 minutes.

Multiply by 60

Divide by 50)95400 seconds.

Answer - 1908 years.

The regular change in the precession ofthe fixed stars, or rather the constant retro-gression of the equinoctial points, seems tocause an irregular variation in their rightascensions and declinations, more or lest,according to their distances from the poleof the ecliptic. Whence it may not beimproper to shew how these may be found,as the cofmical, achronical, and heliacalrisings and settings of the fixed stars, foundby the preceding problems, have respectonly to the present age : and the followingproblem, with which I shall conclude thistreatise, will ssiew the reader how to deter-mine the ancient place of any star agreeable

to