Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica
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SYSTEMA SATURNIUM.
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guus, vix puto obſervabilis erit: </
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<
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xml:space
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nus. </
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<
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xml:space
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nempe cum gr. </
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xml:space
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parallela æquatori eadem anſarum linea conſpicictur. </
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<
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xml:space
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cæ vero parallela fiet Saturno gr. </
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<
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xml:space
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pe quam in locis per quadrantem circuli inde diſtantibus,
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nempe in gr. </
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<
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<
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xml:space
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autem maximum angulum quo linea anſarum eclipticam in-
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terſecat eſſe circiter gr. </
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<
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">23{1/2} obſervationibus anni 1655, 1656
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& </
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<
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xml:space
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">1657 apparuit, talemque ad iſta ſupputanda adſumſimus.
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</
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<
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xml:space
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">Fortaſſe autem, longo ſæculorum lapſu, ſenſim omnia hæc
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loca mutari continget, ſimili quodam motu Saturni globum
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inclinante atque in Tellure noſtra eſt is qui præceſſiones æ-
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quinoctiorum efficit: </
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xml:space
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">atque ita phaſium quoque omnium lo-
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ca transferri neceſſe erit. </
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<
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xml:space
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">Hoc verò non tam facile in cæ-
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teris phaſibus quam in rotunda pateſcet, ad cujus conſide-
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rationem deinceps veniendum.</
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<
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">Schema itaque repetenti manifeſtum eſt Saturnum in-
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">Rotundæ
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phaſeos cau-
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ſæ.</
note
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tegro orbitæ ſuæ circuitu non poſſe non ad eum locum bis
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pervenire, (eſto in B & </
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">D) ubi planum annuli recta ad nos
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dirigatur, productumque in oculos noſtros incurrat. </
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quidem in locis è diametro oppoſitis contingeret, inque iiſ-
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dem perpetuò, ſi ex Sole Saturni motum proſpiceremus; </
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nunc propter motum Terræ in ſua orbita annuum, nonnul-
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la oritur inæqualitas. </
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cto, nec niſi rectam lineam referente, quum neutra plana-
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rum ejus ſuperficierum appareat, ad nihilum rediguntur bra-
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chia ac prorſus intereunt, ſolo rotundo Saturni corpore
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quod intueamur reliquo. </
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<
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">Cujus phænomeni primum teſtem
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Galilæum ſupra commemoravimus, qui anno 1612 ſimpli-
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cem hanc Saturni formam obſervaverit. </
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nos 30 Gaſſendum alioſque complures; </
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<
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que anno 1656. </
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anſæ evaneſcerent, nequaquam tanto tempore perſtare ro-
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tunda phaſis poſſet atque obſervationes teſtantur, toto enim
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ſemeſtri rotundus Saturnus ſpectatus fuit. </
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