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.

A briefe description of the Table of Stadius set downe in the 112. page of his Ephemerides to finde out thereby the dayly latitude of the Moone be it North or South together with the Canon or rule thereof plainly declared by example. Proposition. 45.

THis Table is diuided into 8. collums, wher∣of the first on the left hande contayneth the degrées of euery signe set downe in the front of the Table, which degrées are to be coun∣ted descending from one to 30. for so manie degrées there be in euery signe: and the last collum on the right hand containeth the like number of degrées belonging to the signes set downe in the base or foote of the sayd Table, and this number ascendeth vpward from 1. to 30. and for that purpose it woulde not haue bene amisse to haue set ouer each head of those 2. collums this word gradus, next vnder the word Signa. And of the other sixe collums the first thrée on the left hand doe containe the degrées, minutes and seconds of the North latitude, and the other thrée towards the right hand do containe the degrées, minutes, and se∣conds of South latitude. Moreouer, the 12. Signes are to bée numbred in the front from the third collum on the left hand from 1. to 5. forward toward the right hand, and at the foot from 6. to 11. backward towards the left hand, set downe in arithmeticall fi∣gures.

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.

The Example.

Suppose that you would knowe what latitude the Moone had the first of Nouember 1590. here resorting to the diurnall Table of the Ephemerides, you find according to the day propoūded, the place of the Moone to be in the 16. degrée 49′· of Taurus, and the place of the Dragons head to be in the 28. degrée 14′· of Cancer. Now according to the rule before giuen, you must take the place of the dragon here, which is 28. degrées, 14′· of Cancer out of the 16. deg. 49′· of Taurus, which is the place of the Moone, and be∣cause you cannot take the greater sum out of the lesser, you must adde to the lesser sum 12. signes, which make 360. degrées, and also one signe, for Aries going next before Taurus, in which signe the Moone is, so shall you make the whole sum to be 13. signes 16 degrées 49′· out of which summe you must subtract the Dragons head, which with the signes that goe next before Cancer, coun∣ting from the first point of Aries, do make 3. signes 28. degrées, 14′· which being subtracted out of 13. signes, 16. degrées, 49′ there remaineth 9. signes, 18 deg. 35′· out of which you must al∣so subtract 90. deg. which is 3. whole signes, & so you find the re∣mainder to be 6. signes, 18. degrées 35′· with which last remainder you haue to enter into the table of the Moones latitude, in the foot

wherof you shal find 6. signes, and in the last collum on the right hand 18. & in the next collum towards the left hand, & in the com∣mon angle answerable aswel to the said 18. degrée. as also to the 6 signes, you shal find the latitude of the Moone to be 4. deg. 45′· & 17″· (which seconds may be very wel omitted) and her latitude to be south. But now because there are 35′· more annexed to the 18. degrées of the foresaid remainder, you must find out a proportio∣nall part answerable to those minutes which is to be done thus.

Take out of the table the whole latitude answerable to 6 signes & 19. deg. which is one degrée more, so as now the latitude of the Moone is 4. deg. 43′· omitting the seconds. Then subtract 4. deg. 43′· out of 4. degrées 45′· & there remaineth 2′· Now to find out a proportionall part answerable to the former 35′· you must say thus. If 60′· require 2′· what shall 35′· require? and the quotient yéeldeth 1′· 10″· which being subtracted out of 4. degrées 45′· there wil remaine 4. degrées. 44′· and so much was the south latitude of the Moone at that present day.