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 knowe what starres doe neuer rise nor set in anie Latitude. The 23. Proposition. (Book 23)

YF the starre be a North starre hauing a grea∣ter declination be it neuer so little, then is the altitude of the Equinoctiall answerable to your latitude: As for example, suppose your latitude to be 52. which if you take out of 90. then the remainder is 38. degrées, which is the altitude of the Equinoctiall answerable to that Latitude, otherwise called the complement, then that starre neuer setteth in that Latitude: Againe if it be a South starre hauing greater declination neuer so little then the complement of your Latitude, then that star ne∣uer riseth aboue your Horizon. As for example, in the latitude 52. the starre called Hircus, that is the Goate, being a North starre neuer setteth in that latitude because his North declination is 45.

degrées, which is greater then the complement of your Latitude by 7. degr. Also the star called Lyra, whose declination is 38. degr. like vnto the complement of your Latitude doth neuer set, but on∣ly toucheth your Horizon aswell at his rising as setting, so contra∣riwise the star called Canopus, being a South star hauing 51. degr. 38′· of South declination, neuer riseth aboue your Horizon in the foresaid latitude 52. And by this rule you may iudge in like maner of all the rest of the fixed starres both North and South.