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.

The 18. Proposition, contayning the description of the celestiall Globe, and shewing wherein it is like or differing from the terrestriall Globe. Proposition. 18.

THe Celestial globe is like to the terrestrial globe, in that it is round, hauing both like Axletrées, Poles, hourewhéele with his index, brazen Meri∣dian, quarter of altitude of brasse or Latton with his square head or Zenith, and a halfe circle of brasse or Latton, called the semicircle of positi∣on, also a standing foot with an Horizon of wood diuided into se∣uen seueral spaces, containing in a manner the self same things that are before described in the Horizon of the terrestriall Globe, also in the bodie of the celestiall globe are set downe certaine cir∣cles like vnto the terrestriall Globe, that is to say, the Equinocti∣all and the Ecliptique line. Moreouer the foure lesser circles, that is to say, the two tropiques, the circle Arctique, and the cir∣cle antarctique. But the celestiall Globe differeth from the terre∣striall Globe in these foure things following. First the celestiall Globe hath one thinne demicircle of brasse or Latton more than the terrestriall Globe hath, which Demicircle is diuided into two quarters, each quarter containing 90. degrées, made so at ech end as it may be fastened when néed is, vpon the 2. Poles of the Zo∣diaque, to find thereby the longitude and latitude of euery Star described in the Globe, and therefore may very well bee called the Semicircle of longitude and latitude. The second difference is that whereas the terrestrial Globe is traced with 12. Meridians, diuiding the Equinoctial into 24. spaces, euery space containing 15. degrées. The celestial Gobe is onely traced with 6. Meridi∣ans, diuiding the Equinoctiall into 12. spaces, euery space con∣tayning 30. degrées. The thirde difference is that the celestiall Globe hath not those 8. Parallels of latitude wherewith the ce∣lestiall Globe is traced. The fourth difference is that whereas the terrestriall Globe is couered with an vniuersall Map con∣tayning the foure principal diuisions of the earth, that is, Euro∣pa, Africa, Asia and America: the celestiall Globe is couered with a Map, wherein are painted al the fixed Starres that were

knowne to the ancient Astronomers diuided into 48. Images, with which Images, to the intent you might bee the better ac∣quainted, and that you might the more readily find out any Star described in the Globe, I thought good to set downe a particular description of the said 48. images as followeth.