Clavius, Christoph
,
In Sphaeram Ioannis de Sacro Bosco commentarius
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[Figure 91]
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[Figure 92]
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[Figure 97]
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[Figure 101]
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[Figure 102]
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Comment. in I. Cap. Sphæræ
"/>
mi motu incedit. </
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<
s
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xml:space
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preserve
">Hoc enim neutiquã ſieri poſſet, ſi notabiliterſtylus à centro
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mundi diſtaret. </
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<
s
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xml:space
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">Nam impoſſibile eſt Solẽ circa duo centra inter ſe diſtincta re@
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gulariter poſſe moueri, ut in Theorica Mercurij demõſtratur ab Eraſmo Rein
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holdo. </
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<
s
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xml:space
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">Perſpicuũ igitur eſt, hanc molẽ terræ, quæ inter eius centrum, ſuperfi-
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ciemq́; </
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<
s
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xml:space
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">conuexã intercipitur, nullius eſſe fere quantitatis reſpectu cęli Solis,
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ideoq́; </
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<
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">multo magis reſpectu Firmamenri, tanquam punctum, iudicanda erit.</
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<
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<
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ratio præcedentem quodammodo magis declarans ſit hæc.
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</
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<
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xml:space
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">Inſtrumentis Mathematicorũ, quale eſt Aſtrolabium; </
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<
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">Quadrans, Annulus, &</
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">c. </
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obſeruamus conſtituti in ſuperficie terrę ueras altitudines ſtellarũ, & </
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<
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xml:space
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">Planeta
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rum, excludendo tamen inſeriores tres planetas, ut Lunã, Mercuriũ, ac Vene-
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rem, motusq́; </
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<
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">earundem ſtellarũ, atq; </
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<
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xml:space
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">loca, nõ aliter, quàm ſi hęc omnia in cẽ-
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tro terræ exiſtentes obſeruaremus, ita ut nullũ in hac re errorem, qui ſub ſen-
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ſum cadere poſl
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it, cõmittamus. </
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<
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xml:space
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">Videmus enim per Mediclinium, ſiue Dioptr@
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duo aſtra è diametro oppoſita, quaſi Dioptra perf@ctam nobis mundi diame-
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trũ indicet; </
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<
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">ide
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mq; </
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<
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">iudiciũ de reliquis obſeruationibus habeto. </
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<
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xml:space
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">Manifeſte igi-
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tur concluditur, @olẽ terræ nullius eſſe momentireſpectu machinæ cęleſtis,
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fiquidẽ centra dictorum inſtrumentorũ in terræ ſuperficie conſiſtentiũ coin-
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cidunt prorſus, ſi ſenſuum iudicium conſulamus, cum centro terræ. </
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<
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">Quod ſi
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ſenſibiliter diſtarent huiuſmodi inſtrumenta à terrę medio, mirum in modum
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Aſtronomi in ſuis obſeruationibus deciperẽtur, nullumq́; </
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<
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">horologium Solare
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recte horas indicare poſſet: </
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">quæ omnia experientia quotidianæ repugnant.</
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<
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ratio eſt quoque Ptolemæi loco citato, nempe hæc. </
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<
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xml:space
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">In omnibus
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t
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erræ partibus, mundiq́; </
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<
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">climatibus, eodem tempore à uarijs Aſtronomis ma-
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gnitudo, & </
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<
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">diſtan tia unius eiuſdemq́; </
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<
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xml:space
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">ſtxllæ, Martis uidelicet, eadem eſt depre
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henſa, idemq́; </
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<
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xml:space
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">compertũ habemus in omnibus alijs obſeruationibus, quæ in di
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uerſis Climatibus ſunt factæ, ita ut ſenſibiliter inter ſe non diſcrepent. </
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<
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xml:space
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">Quam-
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obrem merito terra, ut punctum indiuiſibile, cenſebitur, quãdoquidem nullus
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terræ locus ab alio reſpectu unius, eiuſdemq; </
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<
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<
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ratio hæc eſſe poterit. </
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xml:space
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">Si terra eſſet alicuius notabilis magni-
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@udinis collata cum Firmamento, uel etiam cũ cælo Solis, omnia illa abſurda
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conſequeremur, quæ paulo antea infere
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bamus, ſi terra non eſſet in medio mũ-
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di poſita; </
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<
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">propterea quòd, ſi terra non
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eſſet inſtar puncti, minime nosin eius
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ſu perficie degentes in medio, ſeu cen-
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tro mundi eſſemus conſtituti. </
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<
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">Vnde ef-
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ficeretur primo, Nullum Horizontem
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diuidere cœlum in duas partes æqua-
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les. </
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<
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">Quare nullibi medietas cœli conſpi-
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ceretur, neque unquam æquinoctium
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poſſet fieri, ſed perpetuo dies tempore
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æquinoct@j minor eſſet nocte, cum ar-
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cus nocturnus notabiliter maior exi-
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ſteret arcu diurno. </
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<
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">Deinde, Eædem ſtel-
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læ ſereno tempore minores appare-
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rent iuxta Horizontem poſitæ, quàm
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in medio cœli, eò quòd iuxta Horizon-
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lem notabiliter remotiores à nobis eſſent: </
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<
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">quod tamen falſum eſt. </
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<
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bræ gnome
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num in ſuperſiciebus quibuslibet nullo modo tempore </
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