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 know by the Globe what Starres are aboue the Ho∣rizon at any time of the day or night. Proposition. 22.

OF Starres according to diuers latitudes some ar al∣waies aboue the Horizon & some are alwaies vnder the Horizon, & some do both rise and set, if you would know what Starres he aboue the Horizon in the day

time, then hauing rectified the Index of the houre whéele by the 7. proposition, take the altitude of the Sun with your Astrolabe or quadrant, and therewith consider whether the Sun be in the East part or in the West part of the firmament. Then bring the quar∣ter of altitude on the East or West side of the Globe according as you saw the Sun at that present to be in the firmament, and make the degree of altitude, marked in the quarter of altitude to méete euen with the degrée of the Ecliptique line wherein the Sunne is that day, and there staying the Globe, you shall sée all the starres that be aboue the Horizon at that present, as well on the East side as on the west side of the Globe, and the Index will shew you at what houre you took the aforesad altitude. But if it be in the night season, and that the starres doe appeare, take with your Astrolabe the altitude of some known star, and by doing as is before taught, you shal haue your desire. But you must not forget first of all to rectifie the Index of the houre whéele by the 7. proposition.