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ID	Title	Author	Corrected Date of Publication (TCP Date of Publication)	STC	Words	Pages
A44885	A learned treatise of globes, both cœlestiall and terrestriall with their several uses / written first in Latine, by Mr. Robert Hues, and by him so published ; afterward illustrated with notes by Jo. Isa. Pontanus ; and now lastly made English ... by John Chilmead ...; Tractatus de globis et eorum usu. English	Hues, Robert, 1553-1632.; Chilmead, Edmund, 1610-1654.; Pontanus, Johannes Isacius, 1571-1639.; Molyneux, Emery.	1659 (1659)	Wing H3298; ESTC R1097	145,949	311

foot 〈◊〉 Diameter that so it might in some rea●…nable manner admit the description of particu●…r places But this bulk is too vast to bee ●…nveniently dealt withall And in this regard 〈◊〉 think that those Globes of which I intend 〈◊〉 speake in this ensuing discourse may justly bee perferred before all other that have been●… set forth before them as being more capacious then any other for they are in Diameter two foot and two inches whereas Mercator's Globes which are bigger then any other ever set forth before him are scarcely sixteen inches Diameter The proportion therefore of the superficies of these Globes to Mercator's will be as 1. to 2●… and somewhat more Every Countrey therefore in those Globes will bee above twice as large as it is in Mercator's so that each particular place may the more easily bee described And this I would have to bee understood of those great Globes made by William Saunder●…on of London concerning the use of which especially wee have written this discourse For he hath set forth other smaller Globes also which as they are of a lesser bulk●… and magnitude so are they of a cheaper price that so the meaner Students might herein also bee provided for Now concerning th●… Geographicall part of them seeing it is taken out of the newest Charts and descriptions I am bold to think them more perfect then any other how ever they want not their errours And I think it may bee the Authors glorie to have performed thus much in the edition of these Globes One thing by the way you are to take notice of which is that the descriptions of particular places are to bee sought for else where for this is not to bee expected in a Globe And for these descriptions of particular Countries you may have recourse to the Geographicall tables of Gerardus Mercator whose diligence and industry in this Regard seemes to exceed all other before him To him therefore we referre you PONT STRABO in the place above cited by the Author speakes of a Globe of that bignesse not such an one as himself had made but such an one as he could wish were made that so it might be every way absolut●… And indeed with in this age of ours the magnificent and Illustrious Tvcho Brabe who is now deservedly celebrated with the titl●… of a Second Atlas hath made a very faire Coelestiall Globe composed all of wood within and covered over with plates of Copper artificially wrought containing sixe foot in Diameter besides the Meridian and Horizon and other ●…ppendances which may be guessed at by the rest the like whereof so coldly and elaborately framed and every way exactly answering it self I think was never made by any And indeed it is a vast and magnificent piece of worke insomuch that many strangers came out of divers parts into Denmarke while it was there onely to see this Globe But Tycho●…fterward ●…fterward betaking himselfe to the Emperour●… Court caried this Globe with some certaino other Mathematicll instruments with him All which after the death of Tycho were ●…ought for a great sum of money by the Emperour and are now preserv●…d at Prage in the ●…mperiall Castle and shewed among other ●…arities there About the Horizon are read thes●… words written in letters of gold Anno a Christo nato M. D. XXCIV Regnante in Dania Frederico secundo hunc Coelesti machinae conformem Globum in quo affi●…a octavae Sphaerae sidera c●…litùs organis deprehensa suis quaeque locis ad amussim repraesentare Errant●…úmque stellarum per haec apparentias perpervestigare decrevit coelo terrigenis qui rationem eam capiunt Mechanico opere patefacto TYCHO BRAHE O. F. Sibi posteris F. F. Which Globe by reason of i●…s extraordinary magnitude hath this praerogative above all other that all things may be done upon it most exactly and in the very minute especially as farre as concernes the doctrine of the First moveable together with the observations of the Starres and their aspects in respect of the Ecliptick and AEquator all which may bee done mechanically without any ●…edious computations The great Duke of Tuscany hath also two very faire Globes as large as this but made after the ordinary manner the one a Terrestriall Globe but the other an Armillary Sphaere consisting of Circles and Orbes only Now concerning those Globes of Mercator spoken of by our Author the same have been since accurately corrected according to Tycho'●… observations and set forth both in a great and lesser form●… by J Hondius and are still made and sold by his Son And because that in this ensuing discourse of Globes there is often mention made of a Point Line Superficle●… Angle Rhombus Axis and other the like Geometricall tearmes I have thought good to set down the severall definitions of the same A Point is that which hath no parts or a thing supposed to be Indivisible or that cannot be divided into parts A Lin●… is a supposed length without breadth whose extreames or bounds are t●… Points A Right Line is the shortest of all Lines drawn from any two of the same Points Parallels are Lines equidistant from each other which though they should be protended infinitely would never meet in one point but keep still the same distance mutally A Perpendicular is a right Line falling directly on a Right Line and making on each side that Point where they touch two equall Right Angles A Superficies is a Longitude having onely Latitude whose tearmes and limits are two Lines A Figure is that which is comprehended within one or many bands under one bound is comprehended a Circle and all other Figures under many A Tearm or Limit is that which is the end of any thing A Circle is a plaine Figure comprehended under one round line in the midst whereof there is a P●…int from whence all Lines drawn to the Circumference are equall The Center of a Circle is that point in the midst from which all equall lines are drawn to the Circumference The Diameter of a Circle is a Right line passing through the Center terminated at each end with the Circumference and dividing the Circle into two equall Parts A Semicircle is the halfe of a Circle contained within the Diameter and halfe the Circumference An Arch is a portion of a Circle comprehended within a Right line and any part of the Circumference and is alwayes either greater or lesser then a Semicircle An Angle is when two lines are extended upon the same superficies so that they touch one another in a Point but not directy A Right Angle is that which is produced of a Right line falling upon a Right line and making two equal Angles on each side the Point where they touch each other As the Lines A B C. An Obtuse Angle is that which is Greater then a Right Angle as the Angle A C D. An Acute Angle is that which is lesse then a Right as the Angle A C B. A Solid Angle is

being thus noted in the Horizon of the Globe you must afterward translate them into your Plain allotted for your Diall Ground reckoning in the circumference of it so many degrees to each hour as are answerable to those pointed out by the Colure in the Horizon And lastly having thus done the Gnomon or Stile must be erected Where you are to observe this one thing which is indeed in a manner the chiefe and onely thing in this Art to be carefully looked unto namely that that edge or line of the Gnomon which is to shew the hours by its shadow in all kinds of Dials must be set Parallel to the Axis of the world that so it may make an Angle of inclination with its plain ground equal ●…o that which the Axis of the world makes with the Horizon Now that the Stile is to stand directly to the North and South or in the Meridian line is a thing so commonly known that it were to no purpose to mention it And this is the manner of making a Diall on a plain Horizontall Ground Now if you would make a plain Erect Diall perpendicular to the Horizon which is commonly called a Murall and respecting either the North or South you must remember this one thing the ignorance whereof hath driven those that commonly professe the Art of Dialling into many troubles and difficulties this one thing I say is to be observed that that which is an erect Diall in one place will be an Horizontall in another place whose Zenith is distant from that place 90. degrees either Northward or Southward As for example Let there be an Erect Diall made for any place whose latitude is 25. gr this is nothing else but to make an Horizontall Diall for the latitude of 38 degrees And if there be an Erect Diall made for the latitude of 27. gr the same will be an Horizontal Diall for the latitude of 63 degrees The same proportion is to be observed in the rest And hence it manifestly appears that an Horizontal Diall and a Verticall are the same at the latitudes of 45 degrees And so likewise by this rule may bee made any manner of inclining Diall if so be that the quantity of the inclination be but known As for example if a Diall be to be made on a plain ground whose inclination is 10. degrees from the Horizon Southward and for a place whose latitude is 52. gr Northward you must describe in that plain Horizontall Diall for the Latitude of 62. degrees Northward And if in the same latitude the Diall ground do incline toward the North 16. gr you must make an Horizontall Diall for the Northern latitude of 36. gr And thus much shall suffice to have been spoken of the making of Dialls by the Globe The fifth and last Part. Of the Rumbes that are described in the Terrestriall Globe and their use THose lines which a Ship following the direction of the Magneticall Needle describeth on the surface of the Sea Petrus Nonius calleth in Latine Rumbos borrowing the Apellation of his Countrymen the Portugals Which word since it is now generally received by learned writers to express them by we also will use the same These Rumbes are described in the Globe either by greater or lesser circles or by certain crooked winding liines But Sea-men are wont to express the same in their Nauticall Charts by rights Lines But this practise of theirs is clean repugnant to the truth of the thing neither can by any means be defended from errours The invention of Rumbes and practise of describing the same upon the Globe is somewhat ancient Petrus Nonius hath written much concerning the use of them in two Books which he intituleth de Navigand●… ratione And Mercator hath also expressed them in his Globes But the use of them is not as yet so wel known to every body and therefore I think it not unfit to be the more large in the explication of the same Beginning therefore with the nature and originall of them we shall afterward descend to the use there is to be made of them in the Art of Navigation And first we will begin with the originall and nature of the Nauticall Index or Compasse which is very well known to be of the fashion of a plain round Box the Circumference whereof is divided into 32. equall parts distinguished by certain right lines passing through the center thereof One point of it which that end of the needle that is touched with the Magnet always respects is directed toward the North so that consequently the opposite point must necessarily respect the South And so likewise all the other parts in it have respect unto some certain fixed points in the Horizon for the Compasse must always be placed Parallel to the Horizon Now I call these points fixed onely for doctrine sake not forgetting in the mean time that the Magneticall Needle besides that it doth of it own nature decline in divers places from the situation of the true Meridian which is commonly called the variation of the Compass according to the custome of divers Countries is also placed after a divers manner in the Compass For some there are that place it 5. gr 37. m. more Eastward then that point that answereth to the North quarter of the world as do the Spaniards and our Englishmen Some place it 3. gr and almost 18. m. declining from the North and some set it at 11. gr 15. minutes distance from that point all which notwithstanding let us suppose the Needle always to look directly North and South Now these lines thus expressed in the Mariners Compass as the common intersections of the Horizon and Verticall Circles or rather Parallel to these Among which that wherein the Needle is situate is the common intersection of the Horizon Meridian And that which crosseth this at right Angles is the common section of the Horizon and a verticall circle drawn through the Equinoctiall East and West And thus we have the 4 Cardinall winds or quarters of the World and the whole Horizon divided into 4 equal parts each of them containing 90. degrees Now if you divide again each of these into 8. parts by 7. verticall circles drawn on each side of the Meridian through the Zenith the whole Horizon will be parted into 32 equal sections each of which shall contain 11. gr 15. m. These are the severall quarters of the world observed by Mariners in their voyages but as for any lesser parts or divisions then these they look not after them And this is the original of the Nautical Compass by which Sea-men are guided in their voyages Let us now in the next place consider what manner of lines a Ship following the direction of the Compass doth describe in her course For the better understanding whereof I think it fit to praemise these few Propositions which being rightly and thoroughly considered will make the whole business facile and perspicuous 1. All Meridians of all places do

the Sun in the AEquinoctiall from 90. degrees the remainder sheweth the elevation of the Pole As for example The elevation of the Sun at noon when it is in the AEquinoxe is about 38. degrees with us here at London which being deducted out of 90. there remaines 52. Which is the elevation of the Pole with us So at Rome the AEquinoctiall altitude of the Sun is about 48. degrees which being substracted from 90 degrees which is a Quadrant there remaines 42. for the elevation of the Pole In two opposite points of this Meridian are fastened the two ends of a●… iron pin passing through the body of the Globe and its Center One of which ends is called the Arcticke o●… North Pole of the world and the other the Antarctick or South Pole and the pin it self is called the Axis For the Axis of the world is the Diameter about which it is turned And the extream ends of the Axis are called the Poles To either of these Poles whē need shal require there is a certain brass circle or ring of a reasonable strong making to be fastened which circle is divided into 24. equal parts according to the number of the hours of the day night and it is therefore called the Houre-circle And this circle is to be apply'd to either of the Poles in such sort as that the Section where 12. is described ●…ay precisely agree with the points of mid day and mid-night in the superficies of the t●…ue Meridian There is also another little pin or stile to be fastened to the end of the Axis in the very center of the Houre-circle annd this pin is called in Latine Index Horarius and is so made as that it turnes about and pointeth to every of the 24. sections in the Houre-circle according as the Globe it selfe is moved about so that you may place the point of it to what hour you please PONT The use of this Houre-circle and Index is to denote the houres of the riseing and setting of the Sun and other Starrs which must be practised after this manner First you must set the Globe to your elevation or Pole and then apply the degree of the signe in which the Sun at the time is to the Meridian and the Index to the twelfth houre which is uppermost And so having thus done you must turne the Globe about till the degree wherein the Sun is come to the Eastern side of the Horizon which done the Index will point out the houre of his riseing and if you turne it about to the West side you shall in like manner have the houre of his setting There is also belonging to the Meridian a Quadrant of Altitude being made of a long thin plate of steele or brasse and fashioned crooked so that it may be apply'd to the conuexs Superficies of the Globe and having the fourth part of the circle in length And this Quadrant is made in such a sort as that it may be fastened on the Meridian and so be applyed to the Zenith of any place whatsoever being divided from one end to the other into 90. equall parts or degrees There is besides at the foot of the Globe a Mariners compasse placed which serves to shew how to place the Globe rightly according to the Foure winds or quarters of the world CHAP II. Of the Circles which are described upon the Superficies of th●… Globe ANd now in the next place we will shew wh●… Circles are described upon the Globe it selfe And first of all there is d●…awn a circle in an equall distance from both the Poles that is 90. degrees which is called the AEquinoctiall or AEquator because that when the Su●… is in this Circle dayes and nights are of equal length in all places By the r●…volution of this Circle is defended a Naturall day which the Greeks call 〈◊〉 〈◊〉 〈◊〉 〈◊〉 〈◊〉 For a day is 〈◊〉 Naturall and Artificiall A Naturall day is defined to be the space of time wher●… in the whole AEquator makes a full reuolution and this is done in 24. hours An Artific●…all day is the space wherein the Sun is passi●…g thorough our upper Hemisphaere to which is opposed the Artificiall night while th●… Sun is carried about in the lower Hemisphaere So that an Artificiall day and night are comprehen●…ed within a Naturall day The Parts of a dav are called houres which are either Equall or Vnequall An Equall houre is the 24. part of a Naturall day in which space 15. d●…grees of the AEquator do always rise and as m●…ny are depre●…ied on the opposite part An Vnequall hour is the 12. part of an Artificial day betw●…xt the ●…ime of the Suns rising and setting again Th●…se hours are againe divided into Minutes Now a Minute is the 60. part of an hour in which space of time a quarter of a degree in the AEquator that is 15. minutes do ●…ise and a●… many set PONT The use of the AEqu●…tor consists chiefly in these things First it sheweth the time of the AEquinoxes which are alwayes when the Sun falies upon the AEquinoctiall circle And this is when as the Sun enters into the first degree of Aries and Libra according to that of Manil●…us Libra Ariesque parem reddunt noctemque diemque In English thus The Sun in Libra and Aries plac'd each yeare The day and night are equall every where Secondly ●…he AEquator divides the Heauens into two equall parts or Hemisphaeres whereof one is called the Septeutrionall or Northern Hemisphaere the other the Meridionall or Southerne Thirdly it sheweth the ascension and descension of the parts of the Zodiack whence the length of the Artificiall day and night for any position of Sphaere may be known Fou●…thly 〈◊〉 shewes what Starrs and parts of the Eclipticke have any Declination The AEquator is crossed or cut in two opposite points by an oblique Circle which is called the Zodiack The obliquity of this Circle is said to have been first observed by Anaximander Milesius in the 58. Olympiad as Pliny writeth in hi●… lib. 2. Cap. 8 who also in the same place affi●…mes that it was first divided into 12 parts which they call Signes by Cleostretus Tenedius in like manner as we see it at this day Each of these Signes is again subdivided into 30. parts so that the whole Zodiack is divided in all into 360. parts like as the orher circles are The first twelfth part whereof beginning at the Vernal Intersection when the AEquator and Zodiack crosse each other it assigned to Aries the second to Taurus c. reckoning from West to East But here a young beginner in Astronomy may justly doubt what is the reason that the first 30. degrees or 12 part of the Zodiack is attributed to Aries whereas the first Star of Aries falls short of the Intersection of the AEquinoctiall and Zodiack no lesse then 27. degrees The reason of this is because that in the time of the

in a continuall succession of time so that Ptolomies time some certain yeares before him it was found to be 23. gr 51. ½ but it doth not appear by any certain testimony to have been ever greater Whence may be collected that Aratus whome we have set in the first place who assignes 24. gr speakes with the largest and as it were at randome and as our learned Authour hath also observed of Strabo Proclus and Leontius Mechanicus not so accurately as he should have There are also two other lesser circles described in an equall distance from the Poles to that of the Tropickes from the AEquator which circles take their denomination from the Pole on which they border So that one of them is called the Arctick or North circle and and the oppsite circle the Antarctick or Southerne In these circles the Poles of the Ecliptique are fixed the Solsticiall Colure crossing them in the same place Strabo Proclus Cleomedes all Greek Authors and some of the Latines also assigne no certain distance to these circles from the Poles but make them various and mutable according to the diversity of elevation of the Pole or diverse position of the Sphaere so that one of them must be conceived to be described round about that Pole which is elevated and to touch the very Horizon and is therefore the greatest of all the Parallels that are alwayes in sight and the other must be imagined as drawn in an equall distance from the opposite Pole and this is the greatest of those Parallels that are alwaies hidden PONT The Arctique and Antarctique circles do shew 1. The Poles of the Zodiaque and their distance from the Poles of the world 2. They doe distinguish the frigid Zones from the Temperate and with the Tropiques and AEquator they helpe to divide the whole Heaven into five parts or regions which they call Zones Besides these circles expressed in the Globe there are also some certain other circles in familiar use with the Practicall Astronomers which they call Verticall circles These are greater circles drawn from the Verticall point through the Horizon in what number you please and they are called by the Arabians Azimuth which appellation is also in common use among our ordinary Astronomers The office of these circles is supplied by the help of a Quadrant of Altitude which is a thin plate of brass divided into 90. degrees This Quadrant must be applied to the vetrex of any place when you desire to use it so that the lowest end of it noted with the number of 90. may just touch the Horizon in every place This Quadrant is made moveable that so it may be fastened to the verticall point of any place PONT Concerning the moveableness or mutability of the Arctique and Antarctique Circles Joseph Scaliger reports himself to be the first that observed it out of the Ancient Greek Authors as you may see in his Comentaries upon Manilius revised and published by himself a little before his death Neither doth he think that any ancient Latine Author within 400. yeares after those Greek Writers nor scarcely any before Sacrobosco's time can be found to have determined them to be immoveable But because there are many excellent things to be met withall in that pssage of his and that he sets down the same by way of demonstration I have thought it not impertinent seeing our Author hath given a touch at it to set down Scaliger's opin●…n in his own words as you have them upon those verses of Monilius lib. 1. Astron. Circulus ad Boreā fulgentem sustinet Arcton Sexque fugit folidas a coeli vertice partes He proceeds after this manner Describantur circuli AEquinoctiali paralleli XC c. Let there be described saith he 90. Parallel circles to the AEquinoctiall and these will be the same that Gaminus calles 〈◊〉 〈◊〉 〈◊〉 〈◊〉 〈◊〉 alwayes appearing Now among all those That which toucheth the Horizon in the point of intersection of the Horizon and Meridian will be 〈◊〉 〈◊〉 〈◊〉 〈◊〉 〈◊〉 the greatest of those that alwayes appeare and so conseqvently the Arctique Circle of that place now because the Horizons are moveable the Arctique Circles must also be moveable So in the Climat wherein Cnidus lies the elevation of the Pole being thirty six degrees Evdoxus determines the Artique Circle also to be so many degrees from the Pole in like manner in another Climate it will bee diverse according to the diversity of the elevation of the Pole Thus Hipparchus 〈◊〉 〈◊〉 〈◊〉 〈◊〉 〈◊〉 At Athens saith he the greatest of the Circle alwaies appearing is distant from the Pole thirty seven degrees but that in Rhodes thirie sixe degrees and look how great the Altitude of the place is the same must the distance necessarily be betwixi the Pole and that point by which the Artique circle is described And therefore the Ancient Greekes alwayes defined the Arctique circle to be 〈◊〉 〈◊〉 〈◊〉 〈◊〉 〈◊〉 Sive 〈◊〉 〈◊〉 〈◊〉 〈◊〉 〈◊〉 The most Northerne point that their Horizon or place of habitation had So that the Artique circle is nothing else but the pointe of their habitation which toucheth the Horizon For in describing they have both one common point Only in this they differ that the center of the Arctique circle is the Pole of the world but the center of the Horizon is the Verticall circle or Zenith of the place As for example A. F. D. E. is the Horizon A. G C. H. the Artique circle A. D. the Meridian A. the point of Intersection of the Horizon with the Meridian in which place also the Artique and Horizon in describing doe mutually touch each other B. the Pole C. the Zenith of the place I. the opposite point of the diameter of the Actique circle Now if the elevation of the Pole bee full 45. degrees as it is at Vienna in Franc●… then the point I. will be the same with C that is to say the opposite part of the Arctique cir●…le will touch the Zenith of the place Ent if the elevation of the Pole be lesse then 45° degrees the Zenith will then fall without the circle but if it be greater it will fall within S●… that by this meanes it will come to passe that the nearer wee are to the AEquator the lesser these circles will bee and contrarywise the farther we live off the AEquator the greater they are But under the AEquinoctiall it self that is in a right position of Sphaere there is no Artique circle at all Pytheas writes that those that inhabit Thule now call Iseland have a Tropick for their Arctique circle Whether therefore this Circle fal within or without the Tropicke the distance of it from the poi●…t l. Will be as great as is the difference betwixt the elevation of the Pole and the elevation of the Equinoctiall above the Horizon of the place As for Example The elevation of the Pole at Rome is 41. degrees therefore the AEquinoctiall is

time seeing that it is always divided into 12. into●…4 ●…4 equall parts which are therefore called equall houres because they are alwayes of equall length fifteen degrees of the AEquator rising setting every hour For the whole AEquator being divided into 24. parts there are contained in the revolution of it 15. parts of time which is the measure of an hour so that an equall hour is the 24th part of the while AEquinoctiall circle In the latitude of 49. degrees the longest day containeth 16 houres Now therefore when it is 10 of the clock before Noon or the sixth hour after Sun-rising on this day 〈◊〉 to know what unequall hour of the day it is I therefore dispose my proportionall tearms thus 16 give 6 therefore 12. which is the number of equall hours in every day or nigh give 4. and and an half And if we desire to know how many degrees of the AEquator do answer to one unequall hour we may do it thus namely by dividing the whole number of degrees of the 〈◊〉 〈◊〉 Arch by 12. As if the Artificiall day 〈◊〉 〈◊〉 equall houres in length then the Arch of the Diurnall Parallel will be 240 degrees Which if we divide by 12 the quotient which 〈◊〉 will shew the number of degrees in the AEquator that answer to one unequall ●…ou 〈◊〉 like method also is to be observed in finding out the length of the unequall hour of the Night CHAP. XIV To find out the Longitude Latitude and Declination of any fixed Star as it is expressed in the Globe THe Longitude of a Starre is an Arch of Eclipticke intercepted betwixt two of the greater Circles which are drawne thorough the Poles of the Eclipticke the one of which passeth through the intersection of the AEquator and Ecliptick and the other through the Center of the star The Latitude of a Starre is the distance of it from the Eccliptick which is also to bee reckoned in that circle which passeth through the Center thereof Now if you desire to find out either of these you must take the Quadrant of altitude or any other Quadrant of a circle that is but exactly divided into 90 parts and lay one end of it on either Pole of the Ecliptick either Northerne or Southern as the Latitude of the Star shall require Then let it passe through the Center of the Starre to the very Ecliptick and there the other end will shew the degree of Longitude of the same which you must reckon from the beginning of Aries and so that portion of the Quadrant that is contained betwixt the Starre it selfe and the Eclipticke will also shew the Latitude of the Star PONT The manner how to find the longitude and latitude of Starres may bee shewed by this example First let us propose the head of Medusa which is found in the Tables to bee in the twentie one gr 8. and it hath in Northerne latitude twentie three degrees Now therefore in the superficies of the Globe wee must looke for the signe 8. and reckon 21. gr from the beginning of the same on the Eclipticke And the circle that shall bee drawn from the Pole of the Ecliptick through this degree shall be called the the circle of longitude of the head of Medusa After this reckon the latitude of the Starre also in the same circle among the Parallels of latitude beginning from the Eclipticke and so forward toward the Articke Pole because the latitude of it is Northerne untill you have accounted 23. gr which is the number of the degrees of latitude and sheweth the place of that Star Now because that all the circles of Longitude and latitudes neither are nor indeed can conveniently be expressed on the Globe therefore the Quadrant of altitude is to serve in stead of the same for the finding out of the longitudes and situations of the Starres that are set in the Globe and that after this manner Let us take our former example of Medusa 's head the latitude of which being Northerne I apply the end of the Quadrant to the North Pole of the Zodiack otherwise had it been Southern it must have been fitted to the Southern Pole which do●…e I seeke in the Eclipticks for the 21 gr of Taurus which is the logitude of the Starre and having found it I lay the other end of my Quadrant over it For by this means the Quadrant shall supply the office of the circle of Longitude of Medusa's head 〈◊〉 therefore if I reckon 23 degrees on the said Quadrant beginning from the Eclipticke I shall have the true situation of this Starre in the Globe In like manner may we find by a Globe that hath the Starres described on it the longitude and latitude of any Starre in the Heavens For if we fit the Quadrant to the Northern Pole of the Zodiaque if the Starre have Northerne latitude and then let it passe through the center of any Starre the degree of the Ecliptick that the other end of it shall point out will be the longitude of the said Starre and the degrees that are contained betwixt the ECliptick and the Starre will shew you the latitude of the same A for example if the Quadrant being first applied to the Northern Pole of the Zodiaque bee afterward laid along over the the bright Star in the Crown the other end of it will fall on the 6. gr m. which is the longitude of this Starre And then if you reckon the number of degrees betwixt the Eclipticke and the same Starre you shall find them to bee 44½ which is the Northern latitude of the same The Declination of a Starre is the distance of it from the AEquator which distance must bee reckoned on a greater circle passing through the Poles of the AEquator And therefore if you but apply any Starre to the Meridian you shall presently have the Declination of it if you account the degrees and minutes of the Meridian if there be any that are contained betwixt the Center of the Star and the AEquator PONT The Declination of Starres as also their Right Ascension may be known by the Globe in this manner The Star proposed must be applied to the Meridian and forthwith the same Meridian will discover among the degrees of the AEquator the Right Ascension of the same and it will also give you the Declination if you reckon upon it the number of degrees that are comprehended betwixt the AEquinoctiall and the Star proposed And for an example of this let us propose the Great Dog whose right Ascension and Declination wee desire to know First therefore we set the Starre it selfe directly under the Meridian and find the Meridian to cut the AEquinoctiall at 97. gr 15. min. And this is the right Ascension of this Star And then reckoning the number of the degrees comprehended betwixt it and the AEquinoctiall Southward we find them to be 16 degrees which we conclude to bee the Southern latitude of the Starr The same also may be demonstrated