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 knowe when the Sunne riseth and setteth in everie latitude, and thereby the length of the day and night, and al∣so in what rombe or wind he riseth and setteth, and how much he declineth everie day from the Equinoctiall either North∣ward or Southward. Also howe to know the elevation of the Pole, otherwise called the latitude of any place, by knowing the Meridian altitude of the Sunne, and his declination. Chap. 47.

THe most part of all these thinges haue béene taught be∣fore in my Spheare, in my Treatise of the Globes, and also in my treatise of the Astrolabes. And in the first two Treatises I shew also how to finde out the Longitude

of any place, and therefore néedeth not here to be rehearsed: But if you would know how to handle the declination of the sunne be∣ing vpon the sea, then reade 7. 8. 9. and 10. chapters of William Borne his booke called the Regiment of the Sea, and you shal be fully instructed therein: The whole effect of all which Chapters Robert Norman setteth downe in few words in his new Attrac∣tiue in this manner as followeth.

First learne whether the sun haue South declination or North declination, which you shall know by his being in any of the Nor∣therne or Southern signes: Then marke what shadow he casteth, and whether it striketh towardes the Pole whereunto he is née∣rest, or to the contrary. For if the sunne casteth his shadowe the same way that he is from the Equinoctiall, he shalbe betwixt you and the Equinoctiall, & then hauing taken his Meridian altitude subtract the same from 90. & adde vnto the remainder the suns de∣clination for that day, and the summe thereof shalbe the eleuation of the Pole or the distance of your Zenith from the Equinoctiall otherwise called the Latitude which is alwaies equal to the eleua∣tion of the Pole: But if the sun casteth his shadow to the contrary side of the Equinoctiall, that is to say, being in his North declina∣tion casteth his shadow Southward, or being in his south declina∣tion casteth his shadow Northward, then either the Equinoctiall shalbe betwixt you & the sunne, or you in the Equinoctiall, or else you shalbe betwixt the Equinoctial and the sunne, which you shall know thus: Adde the declination of the sunne for that day wher∣in you séeke vnto his Meridian altitude, and if the summe of the addition be lesser then 90. degrées, then so much as it wanteth of 90. degrées shall you be distant from the Equinoctiall on that side on which the shadow stréeketh: but if it amounteth iust to 90. de∣grées, then you shalbe right vnder the Equinoctial. Againe if it be more then 90. degrées, then so much as is the ouerplus, so much shall you be from the Equinoctiall towards the sunne, at which time you shall be also betwixt the Equinoctiall and the sunne.

And if you finde the Meridian altitude of the sunne to be eauen with your Zenith, then looke what declination the sun hath at that instant, and so much shall you be from the Equinoctiall on that side wherein the sunne is: But if the sunne haue no declination, then shall you be right vnder the Equinoctiall line.