Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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<
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>Summa rei huc tandem redìt: Cometarum ingens eſt numerus;
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motus eorum ſunt ſumme regulares, & eaſdem leges cum Plane
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tarum motibus obſervant. </
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<
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>Moventur in Orbibus Conicis, hi or
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bes ſunt valde admodum eccentrici. </
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<
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>Feruntur undiQ.E.I. omnes
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Cælorum partes, & Planetarum regiones liberrime pertranſeunt,
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& ſæpe contra Signorum ordinem incedunt. </
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<
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>Hæc Phænomena
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certiſſime confirmantur ex Obſervationibus Aſtronomicis: & per
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Vortices nequeunt explicari: Imo, ne quidem cum Vorticibus
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Planetarum conſiſtere poſſunt. </
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<
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>Cometarum motibus omnino lo
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cus non erit; niſi materia illa fictitia penitus e Cælis amo
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veatur. </
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<
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>Si enim Planetæ circum Solem a Vorticibus devehuntur; Vor
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ticum partes, quæ proxime ambiunt unumquemque Planetam, ejuſ
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dem denſitatis erunt ac Planeta; uti ſupra dictum eſt. </
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<
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>Itaque
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materia illa omnis quæ contigua eſt Orbis magni perimetro, pa
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rem habebit ac Tellus denſitatem: quæ vero jacet intra Orbem
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magnum atque Orbem Saturni, vel parem vel majorem habebit. </
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Nam ut conſtitutio Vorticis permanere poſſit, debent partes mi
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nus denſæ centrum occupare, magis denſæ longius a centro abire. </
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Cum enim Planetarum tempora periodica ſint in ratione ſeſqui
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plicata diſtantiarum a Sole, oportet partium Vorticis periodos
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eandem rationem ſervare. </
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<
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>Inde vero ſequitur, vires centrifugas
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harum partium fore reciproce ut quadrata diſtantiarum. </
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<
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>Quæ
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igitur majore intervallo diſtant a centro, nituntur ab eodem re
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cedere minore vi: unde ſi minus denſæ fuerint, neceſſe eſt ut ce
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dant vi majori, qua partes centro propiores aſcendere conantur. </
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Aſcendent ergo denſiores, deſcendent minus denſæ, & loeorum
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fiet invicem permutatio; donec ita fuerit diſpoſita atque ordinata
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materia fluida totius Vorticis, ut conquieſcere jam poſſit in æqui
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librio conſtituta. </
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<
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>Si bina Fluida, quorum diverſa eſt denſitas,
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in eodem vaſe continentur; utique futurum eſt ut Fluidum, cu
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jus major eſt denſitas, majore vi Gravitatis infimum petat locum:
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& ratione non abſimili omnino dicendum eſt, denſiores Vorticis
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partes majore vi centrifuga petere ſupremum locum. </
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<
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>Tota igi
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tur illa & multo maxima pars Vorticis, quæ jacet extra Telluris
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orbem, denſitatem habebit atque adeo vim inertiæ pro mole ma
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teriæ, quæ non minor erit quam denſitas & vis inertiæ Telluris:
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inde vero Cometis trajectis orietur ingens reſiſtentia, & valde ad
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modum ſenſibilis; ne dicam, quæ motum eorundem penitus ſiſtere
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atque abſorbere poſſe merito videatur. </
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<
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>Conſtat autem ex motu Co-</
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