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 Example.

Suppose then that you desire to knowe the true place of the Sunne or of the Moone, or of any other Planet at fiue of the clocke in the after noone the 30. of December 1591. at which day you find the Sunne at noontyde to be in the 18. degrée, and 7. minutes of Capricorne, and the next day at noone to be in the 19. degrée and 8′· of the same signe, the difference whereof you finde by subtraction to be one degrée and one minute, with which diffe∣rence you must enter into the table, and séeking for one degrée in the first collum on the left hande, you finde next vnto that on the right hand 2′· 30″· then for one minute which before was named one degrée, you find next vnto it 2″· 30‴· which being added to the former summe last found, maketh 2′· 32″· 30‴· which is the proportionall part for one houre. Then hauing multiplyed that by 5. houres to serue 5. of the clocke in the afternoone, you shall find the product to be 12′· 42″· 30‴· which being added to the first Meridian place, which is 18. degrées and 7. minutes of Capri∣corne, maketh in all 18. degrées 19′· 42″· 30‴· And remember that if your difference be only minutes, then the bodie of the Ta∣ble doth shew the proportionall part. But if the difference doth containe degrées, then the fourths must bee made thirdes, and the thirds secondes, the secondes minutes, and the minutes degrées. And this table serueth for the 7. Planets for euer. Notwithstan∣ding Stadius setteth downe another Table to finde out thereby the proportional moouing of the Moone feruing as wel for houres

as for minutes of houres, which table beginneth at the 144. page, and endeth at the 184. page of his booke.

In the front of which table in euery page are set downe the dif∣ferences of the two places of the Planets which you haue found by subtracting the lesser out of the greater, if the planet be at both noonetydes in one selfe signe, but if she be at the two noontides in two seuerall signes, then such difference is to bee accounted vpon the Ecliptique line, to know howe many degrées the one place is distant from the other, and as for the minutes, if there be any, you may know the difference thereof by subtracting the lesser number out of the greater. And in the outermost collum on the left hande are set downe the houres and minutes marked in the foote with the letter H. signifying houres, and vnder that with the letter M signifying minutes, whereof the houres procéede but to 24. but the minutes extend to 60. which make one houre procéeding by e∣uen numbers in this sorte. 1. 2. 4. 6. 8. &c. and therefore not fin∣ding that houre or minute which you séeke in the sayd collum, you must take the next number which is lesser by one, and so make it vp by adding the first and onlie odde one vnto it, and in each common angle you shall find the proportionall part that is to bee added to the first place of the Planet answering to the day of the moneth wherein you sought. All which thinges you shall more plainelie vnderstand by this one example.