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A16195 Astrolabium vranicum generale A necessary and pleasaunt solace and recreation for nauigators in their long iorneying, containing the vse of an instrument or generall astrolabe: newly for them deuised by the author, to bring them skilfully acquainted with all the planets starres, and constellacions of the heauens ... In which, agreeable to the hipothesis of Nicolaus Copernicus, the starry firmament is appointed perpetually fixed and the earth and his horizons continually mouing from west towards the east once about euery 24 houres. Fraught also by new deuise with all such necessary supplements for iudiciall astrology, as Alkabitius & Claudius Dariottus haue deliuered by their tables. Wherevnto for their further delight he hath anexed another inuention, expressing in one face the whole globe terrestriall; with the two great english voyages lately performed round about the world. Compyled by Iohn Blagraue of Reading Gentleman, the same wellwiller to the mathematicks. Anno. 1596. Blagrave, John, d. 1611. 1596 (1596) STC 3117; ESTC S104607 40,102 66

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13 ½ degrees Southwards from the Equinoctialls intersection and apply that degree by moouing about the Zenitfer vnto the clipticke circle according as you gesse the time of the yeare to be vz. If you thinke it to be betweene Midsomer and Christmas then apply the same 13 ⅓ degr vnto the autumnall hemicicle where ♋ ☊ ♍ ♎ ♏ ♐ are where it must needes touch vpon the 24 degree of ♒ if betweene Christmas and Midsomer then vnto the vernall hemicircle of the others Signes where it must needes our the 6 of ♏ and there shall most assu●edly be th● tru● 〈…〉 the Sunne for that day Which bring had then you may easily by the 5. Cap. euersed as well finde the day answerable thereto as there you found the Sunnes place answerable to the day vice versa Prouided that the Sunnes place be rectified as in the 6. Cap. if neede be Cap. 13. ¶ How to know what it is a clocke at any time either night or day by the S●nne Planets or Starres YOu must alwayes intend that the Planets are weekely placed as in the 3. Cap. is taught Also obserue this rule generall to keepe the noone-line of the Zenitfer still vpwards by turning about your Astrolabe imagining your face turned still to the South except when you are specially to deale with the North line then keepe him vpwards and then imagine your face turned towards the North. Now when you desire to knowe the houre of the day or night you shall as in the last Cap. is mentioned either by a Quadrant or this Astrolabe take the Altitude of the Sunne at any time in the day or in the night of any Starre For Example this yeare 1596 the 2 of October in the morning at my poore house at Swallowfeyld by Reading to see how the time passed I tooke the altitude of the Sunne 15 degrees high And the same euening I tooke the altitude of the great Starre Arcturus 10 degrees high towards the West Which had then shall you prepare your Almicantifer vnto that altitude thus In the Zenith line chosen by the 7. Cap. for your place vz. in the 51 ⅔ Zenith line for vs heere about Reading seeke out among his Almicantare rootes the number of that Altitude taken vz. in the morning I sought 15 for the ☉ and at night 10 for Arcturus there plant the Cursor then reckon on the North line frō your Horizontall point found by the 7 inwards towards the centre the same altitude againe vz. frō the Horizontall point of our latitude being the 51 ⅔ deg of the North-line counted from the center I reckoned inwards for the ☉ 15 degrees and for Arcturus 10 degrees the one fell out at 36 ⅔ degrees from the center the other at 41 ⅔ and thereto set the pointer of the Almicantifer which poynter and Cursor so set I call the Almicantifer prepared Then leade about the Almicantifer which must also leade after him the noone-line vntill the pointer come to touch exactly either the Apex of the Sunnes Carect or the very centre of the Starre by which soeuer you deale and this I call the applying of the pointer to any Planet or Starre There hold the Zenitfer fast and slide downe the Cursor to the centre applying there his Fiduciall line labell-wise to the Sunne which shall shew you in the houre circle the houre desired and this I call labelling of the Sunne to the houre circle Yet vpon these condicions that if you deale for the East Hemispheare that is to say if your altitude taken were on the East part of the Meridian vz. betweene the North and South Eastwards as for the ☉ it was then in this leading about shall the Almicantifer play leftwards of the noone-line towards 6 of clocke in the morning of the houre circle which I call the East Hemispheare and so to leade the noone-line after it leftwards but if your altitude taken were on the West part as for Arcturus it was then shall the Almicantifer play and keepe on the right side of the noone-line towards 6 of clocke at night and leade him about rightwards after him According to which precept the said 2 of October in the morning I applied the Almicantifer his pointer prepared as is said vnto 15 deg to the Apex of the ☉ placed as is said at 20 ⅓ of ♎ in the East Hemispheere and there did I labell to the Sunne which shewed me halfe an houre past 8 in the morning the houre desired Likewise at night I applied the pointer prepared and planted for 10 degrees vnto Arcturus in the West Hemispheare because Arcturus was in the West and then againe I labelled to the ☉ which shewed me in the Houre circle halfe an houre past 7 of the clocke at night the houre desired For alwayes Locus Solis ostendit horam And I dare boldly say that neuer was seene before this more facillitie to know the houre by the Starres by any other Astrolabe or Instrument whatsoeuer Cap. 14. ¶ Another more easy way to finde the houre by the Starres HAuing your Meridian planted about your dwelling place as in the 6 Cap. is taught see into the element if any Starre you know well as by the 25 Cap. you shall easily know hem all be euen therewith either on the South or North part And vpon that Starre sought in the Celestiall place accordingly the North line or noone line either of them now esteemed from the Zenith point and there labell to the ☉ so shall the houre sought shew it selfe in the houre circle vnder the fiduciall line of the Labell or Almicantifer now vsed Labell-wise after the woonted manner this needeth no example If you haue no Meridian perpendiculers set you may at any time presently set them with two stickes by the Pole-Starre it selfe sufficient for this purpose I my selfe alwayes kept a standing marke ready set in such sort that some tree chimney top or gable end should be directly South from the same If no Starre be in the South or North it is not hard to gesse the distaunce of the neerest you see and place your noone or North line accordingly especially by two Starres on either side one to marke what part of their distance your Meridian cutteth and accordingly to place the noone or North line betweene them Cap. 15. ¶ Another easy way by the ☽ TAke the houre which the shade of the ☽ giueth on any Sunne-dyall seeke the same houre in the houre circle and labell it to the Moones Carect planted by the 3. Cap. and then holding fast the Zenitfer labell to the Sunnes Carect which shall shew in the houre circle the houre desired Cap. 16. ¶ How to know the meridian Altitude of the Sunne or any other Planet Starre or point of the heauens in any countrey and what houre of the day or night any of them shall culminate or come to the Meridian of that place THE Carects being planted by the 3 Cap. you shall but applye the noone-line
are the 7 the first to knowe the longitude of the ☽ the second the longitude of ♄ ♃ ♂ ♀ or ☿ the third to get their latitudes the fourth to know whether a Planet be direct or retrograde the fift to know the longitude of any Starre in the Reete the sixt the latitude of fixed Starres the seuenth the longitude of Starres not in the Reete And now I am to rewarne all men that they are all possible by this Astrolabe and by my Iewell also and the whole 7 sauing the 4 are performed by this one Chapter because I would not haue them now daunted with that 38 propos of Stophler who meant it no doubt only by that Astrolabe whereof himselfe wrote Cap. 32. ¶ A ready way by helpe of this Astrolabe heereafter to obserue the motions of Comets BEcause I haue seene some 4 or fiue yeares past a booke entituled Noua theoria Cometarum as I remember set foorth by one Reslyn who taking occasion vppon that great Comet or Blazing-Starre which Anno 1570 was seene so long in the Constellation of Cassiopeia in a manner fixed without motion to imagining therefore that Comet to happen in the very Pole of the Theoricke and that to be the cause why he mooued not thereupon runneth on a course with recitall of diuers Comets and their motions but concluded no certaintie to my remembrance ending his booke with this saying Est quodam prodire tenus si non datur vltra But our late learned countreyman Mayster Digges in his Scala Mathematica found because he had no Parallax that he must needes be beyond the Speere of the ☽ Well no doubt there can not any weighty thing come to perfection at the first second or third assay and therefore to the end it may be a generall care to obserue the motions of Comets when they happen I haue thought good to aduertise euery man in this Cap. that either on this Astrolabe or on the Globe it is a most easy matter when any Planet appeareth to pricke downe his place euen by the very view of his scituation among the fixed Starres seeing by the 25 Cap. before you may so easily learne to know them all As for example in Iuly this yeare 1596 there appeared a Comet with a streaming tayle vpwards in the North-west which vpon Tewsday the 20 of Iuly aforesayd about 9 of the clocke at night I first tooke heede of betweene the two hinder legs of Vrsa maior almost in a streight line but somewhat lower and two parts of the way between the Starre of the fourth light in the neere hocke of the neere hinder legge and the two Starres of the third light in the further foote behinde according whereunto I made a pricke in the Celestiall of this Astrolabe The 21 of Iuly the same houre I sawe him directly in the streight line aforesayde and distant from the sayd two Starres twise their distance The 22 day the same houre I sawe him a little aboue the streight line and but their distance off The 23 of Iuly the night was darke The 24 of Iuly I sawe him aboue those two Starres of the third light and to make an equilater triangle with them all which I noted downe euery night with pricks then followed a fewe clowdy and darke nights and after that 24 day he was no more seene This Comet was seene of many others some fortnight before I sawe him as neere as I could gesse by their relacion euen about the brisket of Vrsa maior a little behinde the hocke of the neere legge afore which also I pricked downe and haue caused those pricks and the trayle of his gate to be grauen in the Celestiall in the Constellacion of Vrsa maior if you marke it though not done fully to my purpose to the end to incite others heereafter to do the like that posterity at the last may finde out whether there be any regularity in their motions If the Comet chaunce to come to the Meridian either in the North or South as this did not in sight then by the last Cap. you may get his longitude latitude euery night and so pricke downe euery dayes motion the more exactly FINIS