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A16193 An apollogie confirmation explanation and addition to the Vranicall astrolabe by the author. Blagrave, John, d. 1611.; Blagrave, John, d. 1611. Astrolabium uranicum generale. 1597 (1597) STC 3115.7; ESTC S204 10,569 11

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the ✚ where I haue set X and there plante the Azimuthall lydger P. And these 3 thus planted shall neuer be stirred so long as you keepe in the 52 latit Then to proceede further if now you follow the fiducyall line of the Verticall lydger thus plāted crosse the Zenitfer frō E you shal perceiue it of it selfe to finde out touch the Zenith point of your latitude that is to say the innermost end of that Zenith line which appertaineth to the 52 latit marked with F whose outer end is marked with B this line B F is the Zenith line of the 52 latit all the rest of his fellowes are of no vse in that coūtry yet is he ioyntly with them deuided by the crosse slope lines which you see into 90 parts though vnequall which are as in the 1 cap. is sayd the 90 Almicantar roots that is to say out of these 90 roots seuerally doth spring the 90 seuerall Almicantares or circles of altitude of the 52 latit which roots are easily reckoned by the vpright numbers set in the left margēt vnto euery 10 of them And because these roots begin frō the outer-most ends thence are nūbered inwards therefore the point B being the outer end of the 52 Zenith line is the roote of the first or 0 Almicantare of this 52 latit which in dede is alwaies the Horizon it selfe For the Almicantares begin frō the Horizon thēce grow lesse lesse til they come to nothing at the Zenith as the parallells grow frō thequinoctiall to the pole where they end at 90 so that euer the Horizō circle is the first or 0 Almicātare This wel vnderstood thē shal you set the fiducial line A D of the Cursor euen with the point B on the Zenitfer there plāt him fast with a screw pin if your work be of mettal so shal he cut the noneline at A thēce apply the fiducial line G F of the Almicātifer in the former figure euē with the noone line therō slide downe the finger of the pointer til it touch the Horizontall lydger at the point X there screw fast the pointer also Lastly you shall frō the point X where the Azimuthall lidger resteth extēd his thread euē with the noone line there slide vp the perle til it touch the Verticall lidger at E there knit the pearle fast with a knot neuer to be stirred in the 52 latit And so at the last your three lidgers thus placed at E R X the Cursor to B A the pointer distant from A according to the quantitie A R the perle from X according to X A your Zenitfer is prepared to the Horizon of this 52 latitude which being done once for all as they say performeth al the Chapters of the booke without any altering or remouing some 2 or 3 Chapters excepted for which the Cursor onely is to be remoued but none of the rest and therefore in regarde thereof the labour is short though it seeme long The Zenitfer thus prepared to the Horizon of the 52 latitude the Howercircles Index set to the ☉ as before for the day and time proposed you may then presently euen with one bare inspection see almost halfe the cōclusions of the booke performed without any labour at all more then to apply the nooneline vnto that planet carrect or starre which you meane to worke vpon Example the 5 day of Marche 1598. proceeding as in the 5. cap. is taught you shall finde the ☉ his place in thecliptick 25 degr 3 min. in ♓ thereto dyrect the Index of the hower-circle by helpe of the Noone-lyne Where let him rest fixed for all that day so haue we no more troble with that part And now will we here worke vppon the great starre of the first magnitude which you see in the face of Taurus cōmonly called Paliliciū Aldebaram or Oculus tauri to knowe his state in the heauens His longitude is easily descryed as in the 2 cap. is shewed by the circles described on the Celestiall to be about 4 deg an halfe and his latitude in like sort to bee almost 5 degrees Southwards from thecliptick for all the Starres which haue North latitudes euen the one halfe of the globe are in this Astrolabe comprehended within the Zodiacke Then do but apply the Noone line of the Zenitfer as before prepared vnto the middle pricke or centre of this starre Oculus tauri it shall there shew you in the Maters limbe 62. deg and better his right ascention and in theclipticke circle foure degrees and better in ♊ his deg of culminacon as in the 8 cap. and in the hower circle almost halfe an hower past 4 of the clock after-noone the time when as hee shall that day culminate or come vnto the meridian in the South part as in the 16 cap. And thus much the bare line sheweth you Now do but marke what point or radiall degree of the nooneline cutteth vppon the middle pricke of the Starre that point shall play as good a part for if you reckon that point or degree according to the numbers set on the noone line you shall find it 16 deg and better and so much is the declination of Oculus Tauri as in the 8 cap. and that Northwards from thequinoctiall circle because hee is within it Then reckon by the radiall de on the nooneline counting them from the vertical lidger set co the latitude as before til you com to that 16 degree ouer the cnetre of the star you shall finde them amount to 36 so much wil his distance from our Zenith be when he commeth to the meridian which 36 deg taken out of 90 leaueth 54 degrees his Meridian altitude as in the 16 cap. And if you turne about the Zenitfer till the North line of Media nox come on this starr so shall the nooneline also whose office alone is now to shew the howers shew you halse hower past 4 in the morning and better the iust time when as Oculus Tauri shall come vnto the Meridian in the North vnder the earth And now if you list to remoue the hower circles Index from daye to day the noone line resting still on the starre may shew you what hower that Oculus ♉ cōmeth to the Meridian euery day of the yeare And as all those Meridian conclusiōs as I may terme them are soone had by bare inspectiō without mouing So you may as redily attaine al the Horizontall conclusions with a verie easie kinde of motion but euē with leading about the Zenitfer by the Almicantifer as one shoulde leade a horse by the halter rounde about an horse mill and all the skill is but to knowe which way to leade him for if your question proposed bee to bee performed on thest halfe of the Horizon which I call the East hemisphere for the Meridian or nooneline alwaies deuideth euery Horizon in two equall parts then must your Almicantifer play
all which by his figure marked with A B C D. you may here see whose line A D is his fiducyall line which must alwayes run verye square crosse the Zenitfer as in the 1. Chap. is shewed his line A B keeping in that motiō euen with the fiducyall line of the Zenitfer at whose point A must be a centre loope hole for the Almicantifer to play vpon And at B let be another centre loope hole with a loope of thread or a hooke alwaies fixed therein to hitch a thread and perle vnto when neede requireth Also I would nowe haue euen for ease as much as for vse three narrowe Cursors O P Q which may bee called lydgers rather then Cursors to be planted for all questions of one latit euen fixed on the Zenitfer the one at the verticall point in the Noonelyne the other at the Horozontall poynte in the North lyne the other at the Azimuthall poynt in the North line also which poynte is alwayes twise so many radiall degrees frō the centre as the latitude of your place amounteth vnto and was not mentioned any where in the Booke and the Verticall and Azimuthall lydgers to haue each a centre loone hole to hitch a thread and pearle vnto when cause requireth NOw to the Explanation which methinks should not nede any vntil past the first 12 chapters because those cōtaine nothing but what is cōmon in euery Astrolabe in a māner most easie to be vnderstood of any that hath read but the first principles of the globe or speare For al the Excētrick circles of the Mater vz. such as are not described on the centre of the Celestiall or Mater of the Astolabe are no other as in the 2 cap. is sayd but thecliptick circle of the Zodiack marked with BC with euery fift of his circles of lōgitude distinguishing the whole face into the 12 signes their parts yssuing frō his poles and euery fift of his parallel circles of latitude passing on ech side towards ech of his poles or so many so much of thē as the proiectmēt wold allow which admitteth but one of the Zodiacks poles within it marked with the letter D. And theron is only the Aequinost circle described cōcentrick cutting thecliptick at the beginnings of Aries Libra at B C whose nūbers deuifiōs because they should not disturbe the Mater are set in the outer limbe thereof where note that B stādeth at the tip of the taile of Cetus C. in the right wing of Virgo D vnder the foote of Draco though some hath said there be no such letters And now who can not easily by the squares made with the crossings of those circles of long latit easily descrye the lōgitudes latitudes of any star carect or constellatiō thereon set or drawē as in the 2 cap. is taught And seing the centre of the Astrolabe marked with A represēteth the north pole of the world about which the Zenitfer moueth The radiall degrees of whose nooneline are nūbered frō thequinoctials intersectiō where the ✚ stāderh either way towards ech pole Who cā be so ignorant but to know that by the leading about thereof by the degrees of the Maters limbe that his fiducyall or noone-line maye shewe the 360 Meridians of the globe though to auoyde confusiō of lines they be not drawē on the Astrolabe that his radial degrees do lymit out the parallelles of latitude or declinatiō frō thequinoctiall by that leading about But to come vnto the residue of the booke wherein our newe deuised tackling is applyed to so excellent vses generall to all Horizons which as it seemeth hath more want of Explanation The first thing you haue now to do when any question is proposed is to set the Index of the hower circle vnto the place of the ☉ for the day or time of your question by helpe of the 5 cap. the noneline that is to say bring the nooneline of the Zenitfer vnto the degree of thecliptick aunswering your daye proposed and then apply the Index of the hower-circle euen therewith so is the hower circle planted for that day and in like sort you shall from day to daye by helpe of the nooneline remoue the Index further further for euery day a degree rebating the odd minuts in the 5 cap. mentioned So shall the nooneline now shew you still theron the hower in euery questiō vnasked as they say without labelling to the son as in most chapters of the booke was vsed although he that desireth variety may now vse both For the Amicantifer labelled frō the cētre of the Astrolabe vnto the Sonnes place in thecliptick as in the booke is vsed either it selfe or one of his three crosse finnes shall shew yow the hower in the hower quadrant of the Cursor so you take those hower numbers which fit vnto the directiō of the fin written thereon that is to say if the Matutine or Pomeridian fin come thereon then the numbers from 1 to 6 must serue if the Antemeridian or Vespertine then those frō 6 to 12. The second thing most materiall to be done is as in the 10 17 cap. I indeuoured to shew to chuse out on the Zenitfer the pointes lines appertaining to your latitude Horizon or place of your abode to prepare him with his furniture to the Horizon of that place Which hauing nowe foure Cursors you shall doe vnderstand I hope with ease And for more facilitie as well in working as nūbering you shall reiect the odd minutes of your latitude if any happen and worke vpon the neerest entire degree as in all auntiēt Astrolabes the vse euer was vntill practise hath made you more perfect for the minutes For example to prepare the Zenitfer to the latitude Horizon of Reading where the latit or poles eleuatiō is by the 10 cap. to be found about 51 2 3 deg you shall in steed of 51 2 3 take 52 deg and accompt that for our latit neglecting the od 20 min. which for commō vse wil hurt little Wherefore you shall seeke out this latit 52 amonge the radiall degrees of the nooneline where I haue in this figure set E there to plant the fiducial line of your Verticall lidger in the former figure marked with O. Thē likewise seke the same 52 latit amōg the radial deg of the North line where I haue set R there to plāt the Horizontall lidger Q. And between those 2 lidgers thus placed you shal euer find 90. radial deg of the Zenitfer as if you tel thē with a stick as they say you may easily try now the 20 min be reiected those 90 ra deg are the 90 intersectiōs of the 90 Almicātares with the North quadrāt of the Meridiā in euery latit therfore I cal thē the North deg Thē seke out twise 52 deg vz. 104 degrees in the Northline reckoned frō the cētre outwards which will fal out at 14 deg without