Descartes, René
,
Renati Des-Cartes principia philosophiae
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in parte à Sole praeterpropter averſà videri adeò ut
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ſi Terra ſtet in lineâ rectà inter Cometam & Solem,
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crines in omnes partes diſperſi circa illum appareant. </
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Et Cometa anni 1475, cùm primùm viſus eſt, comam
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praeferebat; in fine autem ſuae apparitionis, quia
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oppoſitâ coeli regione verſabatur, comam poſt ſe tra
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hebat. </
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>Haec etiam coma longèior eſt vel brevior: tum
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ratione magnitudinis Cometae, in minoribus enim
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nulla apparet, nec etiam in magnis, cùm à noſtro
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aſpectu recedentes perexigui eſſe videntur; tum
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ratione loci, caeteris enim paribus, quò terra remo
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tior eſt à lineà rectâ, quae duci poteſt à Cometâ ad
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Solem, eò ipſius coma longèior eſt; & interdum latente
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Cometâ ſub radiis Solis, ejus comae extremitas inſtar
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trabis igneae ſola conſpicitur. </
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interdum paullò latior eſt, interdum anguſtior; inter
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dum recta, interdum curva; & interdum à Sole dire
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ctè averſa, interdum non ita praeciſè. </
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CXXXIII.
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De Cometarum comâ,
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&svariis ejus phaeno
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menis. </
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Quorum omnium rationes ut intelligantur, novum
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quoddam genus refractionis, de quo in Dioptricâ
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actum eſt, quia in corporibus terreſtribus non nota
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tur, hîc eſt conſiderandum. </
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>Nempe, ex eo quòd glo
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buli coeleſtes non ſint omnes inter ſe aequales, ſed
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paullatim minuantur à certo termino, intra quem
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continetur ſphaera Saturni, uſque ad Solem,
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radios luminis, qui per majores ex iſtis globulis com
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municantur, cùm ad minores deveniunt, non modò
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ſecundùm lineas rectas progredi debere, ſed etiam ex
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parte ad latera refringi & diſpergi. </
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CXXXIV.
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De quâdam, refractio
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ne, à quâ iſta coma
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dependet. </
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Conſideremus, exempli cauſſâ, hanc figuram, in
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multis globulis perexiguis incumbunt alii multò </
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