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 rule or Canon together with a plaine example shewing the vse of the Table.

FIrst knowing the day of the moneth, resort vnto the diurnall Table of motion of the Planets in the Ephemerides, and ha∣uing there found out the motion or place of the Moone, and also of the Dragons heade answerable to the day wherein you séeke, subtract the place of the Dragons head from the place of the Moone, which is easily done so often as the arke of the Moone is greater, that is to say, contayneth more signes and degrées than the arke of the Dragons heade, beginning your account in both arkes from the first point of Aries. But if the arke of the Moone

be lesser than the ark of the Dragons head, so as you cannot make your subtraction, then you must add to the place of the Moone 12. signes, which is 360. degrées, and you must adde also thereunto the number of so many signes as are contayned betwixt the first point of Aries, and the first point of that signe wherin the Moone is at that present, which signe it selfe is not to bee numbred, and when you come to take out of that whole summe the place of the Dragons head, you must first adde to the said place of the Dra∣gons head the number of so many signes as are contained be∣twixt the first point of Aries, and the first point of that signe wherein the Dragons head is at that instant, but not the signe wherein it is, and then hauing made your subtraction, remem∣ber alwayes to take out of that remainder 90. degrées, which is thrée signes, so oft as you haue neede to adde 12. signes to the place of the Moone, and not otherwise, and with that remainder you must resort to the foresaid table of the Moones latitude, as for example.