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 at what houre of the day or night any starre riseth or setteth. The 24. Proposition.

FIrst marke by the outwarde or inward shooting of the longest tippe of the starre, whether it bee North or South: for if it be North, then count amongest the Meridians in the Mater so many Meridians as your Latitude amounteth to, beginning at the Axletrée, and so procéeding towardes the Northeast, which is betwixt the North pole and the Equinoctiall on your left hande, but if the starre be South, then count your Latitude procéeding from the saide Axletrée towards the Southeast, which is betwixt the ringle and the North pole on the right hande, and bring the tippe of the starre to that Meridian which now signifieth your Horizon, and there staying the Rete, bring the labell to the place or degrée of the sunne in the Zodiaque of the Rete, in which the sunne is that day you séeke, and the houre in the limbe whereto the labell poin∣teth, is the houre at which the starre riseth that day or night. Now to knowe when the same starre setteth, you haue no more to doe but to worke with the starre in the Northwest part in such order as you obserued before in the Northeast part of the Astro∣labe. As for example, I would knowe at what houre the Buls eye called Oculus Tauri, doeth rise the last day of Iune the Sunne being then in the 17. degrée and 40. minutes of Cancer. Here because this starre is a North starre, I bring the longest tippe thereof to the 52. Meridian which is our Latitude counting from the Axletrée towardes the Northeast part of the Astrolabe

which is on my left hand, for that Meridian is alwayes the Hori∣zon seruing the Latitude 52. and there staying the Rete, I bring the Fiduciall line of the labell to the place of the sunne which at that day is the 17. degrée 40′· of Cancer as I said before, and I find that the label pointeth to one of the clocke 30′· after midnight: wherefore I conclude that Oculus Tauri riseth that day at that present houre. Now to knowe at what houre that starre goeth downe the same day, I bring his longest tippe to the said Hori∣zon towards the Northwest, and staying the Rete there, I lay the labell to the 17. degrée 40′· of Cancer as before, so that the labell pointeth to foure houres and 20. minutes in the afternoone, at which time he goeth downe, so as he continueth at that time a∣boue the Horizon in the Latitude 52. 14. houres 48. minutes. And to knowe the abode of any starre aboue the Horizon, the next Proposition doth also shew.