Clavius, Christoph
,
In Sphaeram Ioannis de Sacro Bosco commentarius
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Ioan. de Sacro Boſco.
"/>
in occaſum: </
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<
s
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xml:space
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">Idcirco auctor noſter uolens utramque tractationem breuiter
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perſtringere, in tertio cap. </
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<
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xml:space
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">agit de primo illo motu, & </
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<
s
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xml:space
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">de omnibus, quæ ra-
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tione illius accidunt in uariis regionibus, nempe de ortu, & </
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<
s
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xml:space
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">occaſu ſignorum,
<
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quę à primo mobili perpetuo ab ortu in occaſum deferuntur: </
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<
s
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="
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xml:space
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">Item de diuerſi-
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tate dierum, ac noctium, quę ob diuerſum ortum, obitumque ſignorum diuer-
<
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ſis in locis uaria exiſtit; </
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>
<
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xml:space
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">& </
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<
s
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"
xml:space
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">denique de climatibus, in quibus huiuſmudi diuer-
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ſitas reperitur, diſſerit. </
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<
s
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xml:space
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">In quarto uero cap. </
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<
s
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xml:space
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">diſputat de circulis, orbibus, & </
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>
<
s
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xml:space
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">moti
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bus planetarum, & </
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<
s
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xml:space
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">de cauſis eclipſium Solis, & </
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<
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xml:space
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">Lunæ, & </
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<
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xml:space
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">de iis, quę ratione ſecũ
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di motus contingunt. </
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<
s
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xml:space
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">Atque ita’
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compendio quodam uidetur hoc libello totã
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ſcientiam de rebus cœleſtibus fuiſse complexus.</
s
>
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<
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xml:space
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">CAPVT PRIMVM.</
head
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<
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">SPhaera</
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igitur ab Euclide ſic deſcribitur. </
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<
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">Sphæra eſt
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tranſitus circunferentiæ dimidij circuli, quæ fixa diametro
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eouſque circunducitur, quouſque ad locum ſuum redeat. </
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<
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">Id eſt.
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</
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<
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xml:space
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">Sphæra eſt tale rotundum, & </
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<
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">ſolidum, quod deſcribitur ab ar-
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cuſemicirculi circunducto,</
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<
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">COMMENTARIVS.</
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">HOc primum caput continet principia, ac fundamenta totius
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xlink:label
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xml:space
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">Quod in
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primo capi
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te Sphæræ
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agatur.</
note
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Aſtronomiæ, de quibus etiã doctiſſime diſſerit Ptolemæus in pri
<
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ma Dictione ſuę magnæ conſtructionis. </
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>
<
s
xml:id
="
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xml:space
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">Diuidi autem poterit cõ-
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modiſſimæ in quatuor præcipuas partes. </
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>
<
s
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="
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xml:space
="
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">Prima pars continet
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quinque definitiones, duas quidem ſphæræ: </
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<
s
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xml:space
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">tertiam centri ſphæ
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ræ; </
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<
s
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">quartam ipſius axis mundi; </
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<
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">& </
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<
s
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xml:space
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">quintam polorum mundi.</
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</
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</
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<
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<
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ſecunda parte continentur diuiſiones quædam ſphæræ: </
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>
<
s
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xml:space
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">In tertia, quænã
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ſit mundi forma, explicatur: </
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">In quarta denique quaſdam concluſiones de cœ-
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leſti, & </
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">elementari regione auctor demonſtrat.</
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</
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<
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<
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autem duæ ſphæræ definitiones intelligantur, aduertendum eſt, aqud
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">Quãtitatis
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tria tãtum
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ſunt genc-
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ra.</
note
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Mathematicos tria genera quantitatũ duntaxat reperiri: </
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>
<
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tur omnes lineæ, quarum extremitates ſunt puncta: </
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<
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">Sub ſecundo includnntur
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omnes ſuperficies, quæ lineis terminantur: </
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>
<
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xml:space
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">Tertium denique genus corpora,
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ſeu ſolida complectitur, quorum extrema ſunt ſuperficies. </
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>
<
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xml:space
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">Linea eſt longitu-
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do ſine latitudine, vnam tantum habens dimenſionem, qua ſecundũ longum
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diuiditur. </
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<
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">Superficies vero eſt latitudo proſunditatis expers, duas duntaxat
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<
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">Superficies
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quid.</
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recipiens dimenſiones, vnam ſecundum longitudinem, alteram ſecundum la-
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titudinem. </
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<
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<
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">Corpus
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quid.</
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ſiones, longitudinem uidelicet, latitudinem, & </
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<
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</
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<
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<
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">alia magnitudo, ſiue quantitas à Mathematico præter has tres conſide-
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ratur, quod plures dar
<
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i non poſsint, cũ nec plures dimenſiones tribus prędi-
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ctis queant reperiri. </
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>
<
s
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">Quod quidem ad initium librorum de cęlo Ariſtoteles li
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cet conetur multis rationibus probabilibus confirmare, Mathematici tame n
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idipſum unica demonſtratione clariſſima oſtendunt, quam libuit hic </
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