M. Blundevile his exercises containing sixe treatises, the titles wherof are set down in the next printed page: which treatises are verie necessarie to be read and learned of all yoong gentlemen that haue not bene exercised in such disciplines, and yet are desirous to haue knowledge as well in cosmographie, astronomie, and geographie, as also in the arte of navigation ... To the furtherance of which arte of navigation, the said M. Blundevile speciallie wrote the said treatises and of meere good will doth dedicate the same to all the young gentlemen of this realme.

How to find out the Latitude of any Region. The 8. Proposition.

FIrst you must know the place of the sunne, and also his declination, and hauing taken his Meridian altitude, recken the same amongst the Almicanterathes from the Finitor vpwardes, and turne about the Rete from the Pole arctique towards the Equinoctiall on your right hande, vntill it toucheth the Parallel of the sunne, for then looke on your left hand and you shall finde the Finitor to stand at that Latitude which you séeke. As for example, the 12. of Aprill 1591. the sunne being in the first degrée 20. minutes of Taurus, and his declina∣tion being then 12. degrées Northward, I finde his Meridian al∣titude to be 50. degrées, which I count vpon the limbe of the Rete procéeding from the Finitor vpwardes towards the Zenith, and then I turne the Rete vntill I haue brought that Almicanterath to the Parallel of the Sunne, which is 12. degrées, counting the same from the Equinoctiall on the right hande of the mater to∣wardes the North Pole, and there staying the Rete, I finde that on the left hande the Finitor lyeth vpon the 52. degrée of Latitude counting from the North pole downe towardes the

Equinoctiall. The common way of finding the Latitude is thus, if it be in the day time, then take the Meridian altitude of the Sunne, and if the Sunne be in any of the sixe Northerne signes, then subtract the declination of the sunne out of his Meridian al∣titude, and the remainder shall be the altitude of the Equinoctiall aboue your Horizon, which being taken out of 90. the remainder will shew the altitude of the Pole, but if the sunne be in any of the sixe Southerne signes, then you must adde his declination to his Meridian altitude, and the summe thereof shall be the altitude of the Equinoctiall, which being taken out of 90. the Remamder will shew the Latitude or eleuation of the Pole. But to know the latitude of any place in the night season, you must take the Meri∣dian altitude of some knowne starre which both riseth and setteth, then after that you haue taken his Meridian altitude with your Astrolabe, you must learne to knowe his declination, and whether it be Northerne or Southerne, for if the starre haue North decli∣nation, then you must subtract his declination from his Meridi∣an altitude, and the remainder shall be the Altitude of the Equi∣noctiall, which being taken out of 90. shall be the latitude or ele∣uation of the Pole, but if the declination of the star be Southernly, then you must adde his declination to his Meridian altitude, and that summe shal be the altitude of the Equinoctiall, which béeing taken out of 90. the remainder shall be the eleuation of the Pole. And there be diuers other wayes of finding out the latitude of any place, which I haue partly set downe in my Treatise of the two Globes about the latter ende thereof, and partly in my Treatise of Nauigation, whereas I speake of the North starre and of his Guardes.