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england_n cap_n degree_n vincent_n 48 3 16.0804 5 false
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A16189 The light of navigation Wherein are declared and lively pourtrayed, all the coasts and havens, of the VVest, North and East seas. Collected partly out of the books of the principall authors which have written of navigation, (as Lucas Iohnson VVaghenaer and divers others) partly also out of manie other expert seafaring mens writings and verball declarations: corrected from manie faults, and inlarged with manie newe descriptions and cardes. Divided into tvvo bookes. Heerunto are added (beside an institution in the art of navigation) nevve tables of the declination of the sonne, according to Tycho Brahes observations, applied to the meridian of Amsterdam. Together with newe tables and instructions to teach men the right use of the North-starre, and other firme starres, profitable for all seafaring men. By William Iohnson.; Licht der Zee-vaert. English Blaeu, Willem Janszoon, 1571-1638. 1612 (1612) STC 3110; ESTC S117230 368,446 360

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measuring with uncutt Staves perfect and right as it should be the fault thereof is not in the Crosse-staves uncutt but in themselves for that they knowe not how to use the Staffe aright nor understand not the true ground thereof Others that will seeme wiser then the former give a reason thereof to wit that the Staffe must be cutte because of the hollownes of the eye for that otherwise the Staff cannot come to stand so that the end thereof be conjoyned to the middle point or center of the eye or sight this reason hath some showe of truth but notwithstanding is alike untrue erroneus for the Staffe may verie well be sett either on the innermost or outtermost corner of the eye so that the sight of the eye may fall to answer just to the end of the Staffe that this is truth we will prove with good reason as followeth Sette the great Crosse with the middlemost upon like degrees to witte each upon such as for that purpose are marked upon the Staffe then applie the Staffe the Crosses so firmely remayning unto your eye in such manner whether it be on the innermost or uttermost corner it is all one as that you discerne the endes of the Crosses both above beneath just over each other in forme as this figure specifieth If then you drawe straight lines by the endes of the Crosses A B and D C they shall meete just in the middle point of your sight And inasmuch as the Crosses are placed upon like degrees the lines aforesaid shall meet just upon the end of the Staffe seeing that that end of the Staffe representeth the center of the quadrant whereby your staffe is marked So then the foresaid lines or endes of the Crosses answer both just upon the ende of the Staffe and also upon the sight so that it followeth necessarily and appeareth evidently that the ende of the Staffe the sight meet in one or to speak properly both of them stand just in the center of the quadrant Therefore whensoever with the Crosse-staffe you wil take the height of the Sonne or of any Starre then observe diligently how many degrees it is elevated above the Horizon and place the two Crosses upon so many degrees then applie the Staffe to your eye in such manner as that you may see the endes of the Crosses just over each other according as is taught before in such forme then as you finde the Staffe to stand to your eye shall you place the Staffe taking away one of the Crosses when you desire to measure according to such height this is a sure rule which will never faile neither can you possibly misse if you follow it CHAP. XV. Of the breadth of the Landes THe breadth of Landes or Countries is no other then the distance or widenes that is betweene the said Landes and the Equinoctiall Line which is reckoned in a double manner that is northerly and southerly to the number of 90. Such Lands or Countries as lye right under the Equinoctiall Line have no breadth but such as lye northward from it have northerly breadth and they that lye southerly have southerly breadth Example The Iland of S. Thomas in the River Gaban in Guinea lyeth right under the Line and therefore hath no breadth neither northerly nor southerly The Cap S. Vincent in Spaine lyeth northward from the Line 37 degrees and therefore the northern breadth of Cap S. Vincent is 37 degrees The point of Lezaret in England lyeth northward from the Line 50 degrees therefore the north breadth of Lezaret is 50 degrees The Cap de bona Esperance lyeth southward from the Line 34½ degrees therefore the southerly breadth of Cap de bona Esperance is 34 1 ● degrees In like manner you must understand and reckon other Landes Countryes and Townes CHAP. XVI Of the height of Landes and Countries and what it is THe height and breadth of Landes Countries although that in them selves they are divers thinges yet they are alwaies one like unto the other Any Countrie being situated under the breadth of 30 degrees lyeth also in the heigth 30 degrees which by Sea-faring men is taken without difference but what it is or what it hath in it or signifieth fewe men understand and yet it behoveth a Sea-faring man that seeketh for the height of any Countries to be expert therein for that no man without it can well understand how any Instrument whether it be Astralabium or Crosse-staffe no nor the Sea-compasse it self should wel be used for that these things are al built upon one foundation like a chaine hang one upon the other But it may be that some man will object and say that there are many Pilots which do not well understand such things and yet are able to goe directly unto divers places whither they desire to sayle which I confesse to be true but tell me how many times are they deceived how manie times are they in great doubt and fear and how seldome dare they trust unto the height which they have taken or reckoned whē they are to seek out any countrie there by how often tymes hath it heretofore happened that for want of such knowledge ships have sayled out of their way either behinde England or upon France which thought to passe through the chanell between England and France and that in so short and well knowne and common sayled water as to come out of Spaine or France what would such men doe if they should passe the Line and were to seeke or finde out certaine Ilands or that after they had sayled up and downe the Seaes certaine moneths together should then seek out for Lande but I am of this opinion which I knowe everie man will grant that it is much better and more assured to goe a way being guided by his owne eye-sight then like a blinde man to be led by another and knoweth not whether that other seeth well or not but to come againe to our matter touching the height of Countries it is no other but the height of the Pole above the Horizon that is to say so many degrees as the Pole in any Land is lifted up above the Horizō so much is the height of such a Countrie and this height agreeth alwaies with the breadth as aforesaid In the 10 chapter it is shewed that wheresoever a man goeth or turneth alwaies the one half of the Heavens sheweth it self above the Horizon and the other half is hidden from us in the first Chapter it is said that the two Poles stand right one against the other whereby it is evidently to be understood that whensoever a man being upon the earth is right under the Equinoctiall Line that then both the Poles of the World lye right in the Horizon one in the south and the other in the north as much as a man travaileth northward from the Equinoctiall Line and winneth breadth northerly so much the north Pole riseth above the Horizon and