Descartes, René Principia philosophiae 1644
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gantur in &longs;uperficie convex&acirc; materize vorticis AEIO, <lb/>
quae Cometam adhuc involvit, &amp; refractio illa ip&longs;os <lb/>
removeat &agrave; perpendiculari, juxta ea quae in Dioptric&acirc; <lb/>
explicui a: quia nempe radii i&longs;ti mult&ograve; difficili&ugrave;s tran&shy;<lb/>
&longs;eunt per hanc materiam vorticis AEIO, qu&agrave;m per <arrow.to.target n="marg1145"></arrow.to.target><lb/>
illam vorticis AEVX: unde &longs;it, ut long&egrave; pauciores <lb/>
perveniant ad Cometam, qu&agrave;m &longs;i refractio i&longs;ta non <lb/>
fieret; hique pauciores, inde ad oculum reflexi, po&longs;&shy;<lb/>
&longs;unt e&longs;&longs;e nimis debiles ad eum movendum. </s><s>Alia ver&ograve; <lb/>
ratio e&longs;t, qu&ograve;d valde &longs;it credibile, quemadmodum <arrow.to.target n="marg1146"></arrow.to.target> ea&shy;<lb/>
dem &longs;emper Lunae facies terram re&longs;picit, ita &longs;emper <lb/>
eandem cuju&longs;que Cometae partem ver&longs;&ugrave;s centrum vor&shy;<lb/>
ticis in quo ver&longs;atur, converti, eamque &longs;olam radiis <lb/>
reflectendis aptam e&longs;&longs;e. </s><s>Sic nempe, c&ugrave;m Cometa e&longs;t <lb/>
in 2, illa ejus pars quae radios pote&longs;t remittere, <arrow.to.target n="marg1147"></arrow.to.target> oppo&shy;<lb/>
&longs;ita e&longs;t centro S, nec ide&ograve; videri pote&longs;t ab iis qui &longs;unt <lb/>
juxta F &longs;ed progrediendo &agrave; 2 ad 3, invertit &longs;e brevi <lb/>
tempore ver&longs;&ugrave;s F, atque ide&ograve; ibi tunc incipit videri. </s><s><lb/>
Nam rationi valde con&longs;entaneum e&longs;t, prim&ograve;, ut pute&shy;<lb/>
mus, dum Cometa tran&longs;it ab N per C ver&longs;us 2, illam <arrow.to.target n="marg1148"></arrow.to.target><lb/>
ejus partem quae &longs;ideri S obver&longs;a e&longs;t, magis agitari &amp;, <lb/>
rarefieri propter actionem i&longs;tius &longs;ideris, qu&agrave;m aliam <lb/>
partem ab eo aver&longs;am. </s><s>Secund&ograve;, ut putemus agita&shy;<lb/>
tione i&longs;t&acirc;, tenuiores &amp; (ut ita loquar) molliores par&shy;<lb/>
ticulas tertii elementi, quae &longs;unt in ejus &longs;uperficie, ab <arrow.to.target n="marg1149"></arrow.to.target><lb/>
e&acirc; &longs;eparari: unde &longs;it ut radiis reflectendis aptior eva&shy;<lb/>
dat, qu&agrave;m &longs;uperficies alterius partis. </s><s>Quemadmodum <lb/>
ex iis quae de igne infr&agrave; dicuntur b, poterit intelligi,