The description and use of the universall quadrat.: By which is performed, with great expedition, the whole doctrine of triangles, both plain and sphericall, two severall wayes with ease and exactness. Also the resolution of such propositions as are most usefull in astronomie, navigation, and dialling. By which is also performed the proportioning of lines and superficies: the measuring of all manner of land, board, glasse; timber, stone. &c. / By Thomas Stirrup, Philomathemat.

CHAP. XLI. The longitude and latitude of any planet or fixed star being given, to sinde his Declination and right Ascension.

FIrst, seek the stars latitude among the parallels of lati∣tude, and upon the parallel of latitude count his lon∣gitude, and where this count endeth, there is the true place of the Starre, both in respect of longitude and lati∣tude, this point being found, look what parallel of decli∣nation passeth thereby, for that is the declination of the Star from the Equinoctial; and also look what meridian meeteth you there, for that is the right ascension of the starre counted from the equinoctial point Aries.

As for example, let the declination and right ascensi∣on of the bright Starre Arcturus be required, whose lati∣tude from the ecliptique is 31 degrees North, and longi∣tude in the 19 degrees 22 minutes, ♎ now looking the 19

degrees 22 minutes ♎ upon the parallel of 31 degrees, North latitude, I finde there to meet me the parallel of 21 deg. 10 min. North declination, and also the meridi∣an of just 14 houres of time from the equinoctial point Aries, and such is the declination and right ascension of Arcturus, which was required.