Clavius, Christoph
,
In Sphaeram Ioannis de Sacro Bosco commentarius
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[Figure 91]
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Ioan. de Sacro Boſco
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motu, quorũ unus eſt ab ortu in occaſum, alter uero ab occaſu in ortum, mo
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xml:space
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">Cur motus
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trepidatio-
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nis in cælo
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ponatur ab
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Aſtrono-
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mis.</
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ueri, ſed habere etiam propriũ motũ acceſſus & </
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<
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">receſſus, quem trepidationis
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dicunt: </
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<
s
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xml:space
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">oſtendendum nunc eſt, quæ phænomena, apparentiæve Aſtronomos
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coegerint, ut hunc motum in cęlo ponerent. </
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<
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xml:space
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">Non paucienim motum hunc
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omnino explodendum à ſcholis Aſtronomorũ, tanquam ridiculum, arbitrã
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tur. </
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<
s
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xml:space
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">Primo ergo obſeruarũt, ſtellas fixas inæqualiter incedere ab occidẽte in
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orientem: </
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<
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xml:space
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">Nunc enim velocius, nunc tardius, nunc nullo pacto moueri in Zo
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diaco uidebantur, nunc uero retrocedere ab oriente in occidentem, p̃ter il-
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lum motum diurnum, & </
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<
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xml:space
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">eandem nihilominus diſtantiam à centro mũdi ha
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bere. </
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<
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xml:space
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">Quare dixerunt eas moueri à ſeptentrione in auſtum, & </
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<
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xml:space
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">contra, ut ſu-
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pra declaratum fuit in motu illo acceſſus & </
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">receſſus. </
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<
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accidit tota iſta inæqualitas motus ſtellarum fixarum, ut facile intelligi po-
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teſt ex aliquo inſtrumento materiali ad hanc rem fabricato. </
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<
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xml:space
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">Hanc quoque
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Aſtronomi aſſerunt eſſe cãm, ꝙ tam uariæ opiniones exortæ ſint de quantita
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te, ſiue periodo motus ſtellarum fixarum ab occidente in orientem. </
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<
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xml:space
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">Rurſus
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animaduertunt, maximam ſolis declinationem uariam extitiſſe in diuerſis
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temporibus, nunc. </
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</
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<
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">Quamobrem coacti ſunt admittere hunc motum trepidationis, ut huius ua-
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rietatis in maxima ſolis declinatione poſſent reddere cãm: </
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<
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">Poſito enim hoc
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motu, ſequitur octauam ſphæram modo à ſeptentrione in auſtrum, modo ab
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auſtro in ſeptentrionem declinare, & </
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<
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">ex conſequenti duos tropicos in orbe
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Solari, aliquando propinquiores fieri æquinoctiali circulo, aliquando uero
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magis ab eo diſtare, ut in theorica octauæ ſphæræ explicatur. </
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<
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">Poſtremo ob-
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ſeruatum fuit ab illis, æquinoctia accidiſſe, antequam Sol ad ♈, primi mobi-
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lis perueniret, aut ad ♎, immo poſtquam aliquando iam tranſiuerat princi-
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pium ♈, aut ♎. </
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">Pari ratione facta fuiſſe Solſtitia, etiamſi Sol non extiterit in
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principio ♋, vel ♑. </
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xml:space
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">Cum igitur Sol neceſſario reperiri debeat in Æquino-
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ctiali circulo, ut fiat Æquinoctium. </
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">Item in tropicis, ut contingant Solſtitia,
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non potuit huius diuerſitatis alia cauſa aſſerri, præter motum trepidationis: </
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Ad hũc enim motum facile conſequitut anticipatio illa Æquinoctiorum, & </
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Solſtitiorum. </
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<
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">Hoc porro motu omnes quoque globi ſeptem planetarũ mo-
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uentur, ita ut orbes omnium planetarum, concomitentur aſſidue Zodiacum
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octauę ſphæræ. </
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<
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">Quemadmodum autem certum uidetur, ut uel motus trepi-
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dationis, uel aliquid ſimile in octaua ſphæra concedatur, propter apparen-
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tias dictas: </
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<
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">ita incertiſſimus eſt modus, quo eum Aſtronomi explicant: </
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mirum principia ♈, & </
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">♎, octauæ ſphæræ deſcribant circulos circa initia ♈,
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& </
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">♎, nonæ ſphæræ, quorum ſemidametri contineant grad. </
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<
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<
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fitione multa conſequantur, quæ cum experientia pugnare uidentur, ut in
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theorica octauæ ſphæræ copioſe explicabimus.</
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<
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">Ex ijs, quę de motibus cælorũ dicta ſunt, perſpicuum relinquitur, cęlos
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omnes unũ corpus continuũ minime efficere, propterea quòd cęli uarijs & </
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diuerſis motibus quodammodo oppoſitis, ut dictum eſt, feruntur; </
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<
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tem corpus cõtrarijs ſimul motibus ferri eſt aptũ. </
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<
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ctenus reperti concentrici cum mundo uniuerſo, atq. </
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<
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">contigui inter ſe, ita vt
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inter quoslibet duos ꝓximos orbes nihil ſit intermediũ, quod ſit uel </
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