Clavius, Christoph
,
Gnomonices libri octo, in quibus non solum horologiorum solariu[m], sed aliarum quo[quam] rerum, quae ex gnomonis umbra cognosci possunt, descriptiones geometricè demonstrantur
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<
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SOCIETATIS IESV.</
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lineis perpendicularibus, & </
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<
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mus vſus eſt in horologiorum deſcriptionibus, quas ſuperiori-
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bus libris tradidimus, difficultate rei perterriti diffidunt, ſe poſ-
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ſe aliquando horologium aliquod ſine errore delineare, quod
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<
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putent, fieri non poſſe, vt in tot perpendicularibus lineis, pa-
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rallelisque occultis ducendis, quæ ad rectam horologii deſcri-
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ptionem requiruntur, errorem aliquem non committant; </
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<
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ſum eſt hoc libro viam, ac rationem præſcribere, qua quiuis,
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qui vel mediocriter in tabula ſinuum verſatus ſit, proprio Marte ſibi tabulas quaſ-
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dam poffit ſupputare, ex quibus deinde horas cuiuſcunque generis ſine moleſtia
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vlla, laboreve in quocunque plano propoſito deſcribere queat, ad datam etiam ſty-
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li magnitudinem quamcunque. </
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<
s
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">Negare enim non poſſum, perdifficile eſſe, ne di-
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cam, fieri omnino non poſſe, vt in tanta multitudine occultarum linearum perpen
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dicularium, atque parallelarum in nullum errorem labatur quis, etiamſi ea in re
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<
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diu, multumq́ue ſeſe exercuerit. </
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<
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">Quod in deſcriptione horarum per tabulas, quas
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iam iam ſupputabimus, contingere tam facile non poteſt, vt ex ſequentibus fiet
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perſpicuum.</
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<
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<
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">ALTITVDINEM Solis ſupra quemcunque circulum maxi-
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mum ſphærę pro ſingulis horis inueſtigare.</
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<
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<
s
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">QVA ratione altitudo Solis ſupra Horizontem ex data hora ſit ſupputanda, abundè
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docuimus propoſ. </
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<
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<
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<
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<
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xml:space
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maximum, qui ab Horizonte differat, hoc modo. </
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<
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</
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<
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<
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<
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<
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">altitudo poli ſupra circulum propoſitum: </
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<
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">Deinde ad hanc altitudinem
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altitudo Solis meridiana, eiuſdemq́ue depreſſio inueniatur, vt in ſcholio huius
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propoſ. </
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<
s
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">docebimus, ſumaturq́ue dimidium rectæ compoſitæ ex ſinu dictæ altitu-
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dinis meridianæ, & </
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<
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">Poſtremo diſtantia Solis à Meridiano circulo
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xml:space
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">Diſtantia Solis
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à Meridiano
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proprio cuiuſ-
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cunque circuli
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maximi qua at
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te exploretut.</
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proprio dati circuli maximi, hoc eſt, à circulo per polos mundi, & </
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<
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">per polos circuli propoſiti du-
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cto, inſtar Meridiani, inueſtigetur. </
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<
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">Quam ita inueniemus. </
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<
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">In circulis, ad quorum plana Meridia-
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nus Horizontis rectus eſt, qualis eſt Verticalis circulus proprie dictus, circulus horę 6. </
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<
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">à meridie,
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vel media nocte. </
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<
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">cui horologium polare æquidiſtat, Æquator, & </
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<
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<
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natus, & </
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<
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">ad Meridianum rectus, ſumitur diſtantia à Meridiano, vt in Horizonte docuimus ad
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initium propoſ. </
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<
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<
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<
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<
s
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xml:space
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">quia Meridianus Horizontis eſt etiã illorum circulorum Meridianus, vt
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patet. </
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<
s
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xml:space
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">In aliis autem circulis explorandum prius erit per propoſ. </
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<
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<
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<
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<
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">quanta ſit inclinatio
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proprii Meridiani cuiuſque illorum ad Meridianum Horizontis, & </
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<
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le Meridianus vergat, hoc eſt, an in ortũ, occaſumve à Meridiano Horizontis recedat; </
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<
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dem facile percipiemus ex ſitu poli circuli maximi propoſiti, vt in lib. </
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<
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<
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<
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<
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</
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<
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">& </
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<
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<
s
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">Hac enim re perſpecta, difficile non erit, quantam diſtantiã à proprio Meridiano propoſiti
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circuli habeat Sol qualibet hora, cognoſcere. </
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<
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">Nam ſi Meridianus proprius circuli maximi propo-
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ſiti à Meridiano Horizontis in ſumpto hemiſpherio recedat in ortum, ſumenda erit diſtantia
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Solis à meridie, vt ad initium propoſ. </
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<
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<
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">lib. </
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<
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<
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