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ID Title Author Corrected Date of Publication (TCP Date of Publication) STC Words Pages
A08487 A new handling of the planisphere diuided into three sections. In the first is a plaine and sensible explication of the circles of the sphere, and such termes as appertaine vnto the doctrine de primo mobili ... The second sheweth how vpon any plaine ... hauing one circle diuided into degrees, and crossed vvith tvvo diameters at right angles, most conclusions of the astrolabe may for all latitudes or countries be readily and exactly performed onely vvith ruler and compasses. In the third, being a supplement organicall, is contained the making of certaine easie instruments for the perfecter working the former conclusions, as to know what degrees and minutes be in any circumference giuen ... Pleasant and profitable generally for all men, but especially such as vvould get handines in vsing the ruler and compasse ... vvithout being at the charge of costly instruments. Inuented for the most part, and first published in English by Thomas Olyuer. Oliver, Thomas, d. 1624. 1601 (1601) STC 18810; ESTC S113509 50,163 103

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many exquisite arguments which I meane not to prosecute but hoping from the testimonie of sense in such manner to deduce the positions that any meane capacitie may haue so reasonable a conceit of them that with probabilitie they may easily be admitted I will referre their exact and more subtile demonstration with the reproofe of such as impugne them to some others handling or to some other place Therefore requiring first the reader not to cast vntimely doubts nor hastily to iudge of any part by it selfe before he hath considered and in some manner vnderstood the whole discourse I will according to Hippocrates his counsell begin with the notablest and easiest things Whosoeuer doth but cast vp his eyes vnto heauen presently perceiueth that it compasseth him round about in manner of halfe a globe or an Hemisphere and if he stand vpon some high place or be at Sea farre from land where nothing can be séene but water and the Skie his eye if he turne himselfe about will represent vnto him at the lowest bounds or limits which he seeth the fashion of a circle vpon whose plaine as vpon a base this visible Hemisphere seemeth to be placed therefore that Circle was first in Gréeke and is now commonly in English called the Horizon that is to say bounding or limiting vz. the compasse of your sight The largenes of this Circle euen as it falleth vnder view is of so great a compasse as you neede not restraine the center thereof according to the precise Mathematicall definition to one determinate exquisite indiuisible and very poynt or pricke but without sensible error as your eye will plainly testifie any one at pleasure may bee taken in the place where you stand From a center so taken if there be or be imagined a plumbe line or line perpendicular to the plaine of the Horizon extended vnto the heauen the place which there it toucheth is commonly called by an Arabian name the Zenith being in truth the pole of the Horizon and the line it selfe his Axis By this Axis and any lines crossing it if plainnes be euery way extēded reaching vnto heauen they marke out their circumferences or semicircles cutting one another in the Zenith but in the Horizon their sections are right lines cutting one another in his center Those circles are named Azimutes and are imagined by Astronomers to be cut by other circles parallel to the Horizon which they terme Alinicantars and circles of Altitude because the portion of the Azimute which is betwéene the Horizon and the Parallel sheweth how his aboue the Horizon that poynt of the Parallel is by which the Azimute passeth Furthermore in a cléere night beholding the bright shining Starres you shall euidently perceiue how they change their places continually some to rise and shew themselues other to goe downe vnder the Horizon and to be hidden from your sight onely if you place your selfe so that your right hand be towards their rising and your left hand toward their going downe looking right foorth and somewhat vpward you shall behold certen Starres which are all times of the night to bée seene and neuer Charles Wayne pole star Little Beare go down amōgst some of which placed after this fashion there is one commonly called the Pole star which being the last in the tayle of the constellation called the little Beare lyeth in māner directly as it were in a right line with those two in the hindermost whéeles of Charles his wayne This Starre seemeth little or nothing to remoue out of his place and indeede not farre from it there is a poynt or pricke which remaineth in one and the same place alwaies immoueable The Azimute passing by the Horizons Axis and a right line drawne frō this immoueable point or the pole starre is properly called the Meridian circle the common section of it and the Horizon being a right line is the Meridian line or the line of North and South the right line which crosseth this Meridian line at right angles in the center of the Horizon is called the line of true East and true West or simply the line of East and West which poynts the ends thereof extended directly fall vpon The Arimute standing vpon this line Ioannes de Roias others specially such as write of Dyalling as it were for dignitie and preheminence doe call the Verticall circle which name being common to all Azimutes because they passe by the Zenith in Latin called Vertex or punctum eregione verticis for a distinction Gemma Frosius hath named it the Circle of the East The other Azimutes haue no proper names but are measured or determined in the Horizons circumference That and so likewise all other Circles Astronomers doe imagine to be diuided into 360. equall parts which they name degrées that is to say euerie quarter or quadrant into 90. degrees euery degrée they further diuide into 60. minutes euery minute into 60. seconds euery second into 60. thirds and so continue sometimes vnto tenths and may goe further if they will By these degrees minutes c. which are betwéene that point where any Azimute cutteth the Horizon and the Meridian line or the line of East and West the Azimute is determined assigned or said to be giuen Vpon the points where the Verticall circle cutteth the Horizon which poynts are the true poles of the Meridian and the precise East and West if by often and diligent viewing you shall see two Starres the one in the East and the other at the same time right against it in the West in winter time euen in one night you may behold that which is in the East first ascending and then againe descending at length to come into the West and that which was in the West being till that time hidden from your sight then to appeare againe rising in the East all this while continually the like shape of an Hemisphere being still represented to your eye without any chaunge or alteration whereby you may gather the heauen to bee a perfect Globe or Sphere hauing that part vnder the Horizon equall and like to that which you sée aboue it and that the place where you stand is the very center thereof A line drawne from the pole Starre or rather from the poynt immoueable before mentioned called the Articke or North pole a line I say drawne or imagined to be drawne from that poynt to the place of your standing is called the Aris of the world and extended to the other side of the celestiall Sphere which is vnder vs falleth there vpon the South or Antarcticke pole which in these our countries neuer appeareth These things being but a little héedily considered be so manifest and apparant that neither example nor figure is greatly requisite for the perfect vnderstanding of them yet in this beginning to remoue all difficultie and to make euery thing as plaine as may be doe thus much In some plaine ground or rather vpon a poste or stone or some such like thing made