Fabri, Honoré, Dialogi physici in quibus de motu terrae disputatur, 1665

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              hoc ipſum eſt, quod iam aliàs innui cùm de Saturno confabularer; nem­
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              pe ex duplici motu recto, altero ſcilicet naturaliter accelerato, altero
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              æquabïli, hæc linea parabolica naſcitur, vt multi demonſtrarunt. </s>
              <s id="s.000326">Dixi
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              phyſicè loquendo, quia neque arcus circuli eſt linea recta, neque lineæ
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              ductæ ad idem centrum ſunt parallelæ, neque fortè motus apparens in
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              illo arcu eſt æquabilis. </s>
              <s id="s.000327">At verò in Venere, in qua longè maior arcus aſſu­
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              mitur, vt DL, cùm hic aſſumi non poſſit, vt linea recta, quæ ſit baſis ſemi­
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              parabolæ, linea SPL non eſt, etiam phyſicè loquendo, parabolica. </s>
              <s id="s.000328">Vt
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              autem nonnihil, obiter ſaltem, indicem, ſit BN radius illius circuli, quem
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              Venus æquali tempore cum Sole decurrit, ſit vt BS ad SN, ita circulus
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              ſub radio BC ad arcum SX; ſit SO ſegmentum acceſſus ducto ex B
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              arcu OP, ducetur linea per punctum P: pari modo alia puncta habebun­
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              tur; cogita punctum S moveri per SD motu accelerato, & ſimul cum axe
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              BS versùs X, circa centrum B, initio, velociùs: ſub finem, tardiùs; deſcri­
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              bet curvam SPL, quæ eſt ſpecies quædam ſpiralis, ſeu fortè nova quæ­
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              dam ſpecies parabolæ, in qua, arcus paralleli in locum applicatarum
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              ſubſtituuntur; ita vt v.g. quadratum OP ad quadratum DL, ſit vt SO,
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              ad SD, & vt tantulum Geometrizemus, cùm hæc figura ſit homogenea
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              ſemiparabolæ, ſunt enim arcus vt applicatæ, ſi ducatur arcus LD in 1/
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              SD,
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              habebitur area dictæ figuræ: ſi autem idem arcus DL ducatur in 1/
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              DB,
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              habebitur ſector BLD. </s>
              <s id="s.000329">Igitur figura SLD eſt ad dictum ſectorem, vt
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              1/
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              SD ad 1/
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              DB. </s>
              <s id="s.000330">Sit etiam vt BD ad BS, ita BS ad tertiam BF, erit ſector
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              BLD ad ſectorem BHS, vt BD ad BF; ſunt enim ſectores ſimiles in
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              duplicata; igitur ſector BLD ad reliquum trapezium LHSD vt BD
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              ad DF, vel vt 1/
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              BD ad 1/
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              DF. </s>
              <s id="s.000331">Igitur LSD ad dictum trapezium vt 1/
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              SD
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              ad 1/
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              FD; igitur LSD ad reliquum triangulum SHL vt 1/
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              DS ad
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              DF
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              minùs 1/
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              SD. </s>
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            <p type="main">
              <s id="s.000332">
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              Auguſtin.
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              Hæc mihi non parum arrident; ſed omitte quæſo hæc Geo­
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              metrica, alioquin vix ab iis te abſtrahere potero; probè igitur intelligo,
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              quomodo in hac tua hypotheſi, omnia quorum huc vſque meminiſti Ve­
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              neris Phænomena explicentur; nonnulla tamen ſuperſunt, quæ fortè plus
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              negotij faceſſunt v.g. cur maxima Veneris declinatio modò maior ſit,
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              modò minor, cur Venus aliquando matutina, ſimul & veſpertina eodem
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              die videatur; cur eiuſdem latitudo Borealis ſit maior quàm Auſtralis, alia­
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              que hujuſmodi. </s>
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            <p type="main">
              <s id="s.000333">
                <emph type="italics"/>
              Antim.
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              </s>
              <s id="s.000334"> Parum negotij cuncta hæc mihi faceſſunt, ſecus fortè vobis
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              ac proinde tot epicyclos, excentricos, circellos, librationes arcus, Ellipſ
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              ſes, Epicyclorum Epicyclos multiplicatis; quibus etiam admiſſis, vix fi­
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              nem vobis propoſitum obtinetis; itaque illa omnia cum meo ſimpliciſſimo
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              motu facillimè explico: vbi enim Venus pervenit ad M, id eſt, ad illum
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              circulum ineundum quem æquali cum Sole tempore decurrit, dum hic
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              eſt in mediocri diſtantia D ; ſi Sol ſit in Apogæo, cum in conſequentia,
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              id eſt versùs Ortum Sol plus promoveri videatur, quia maiorem circu­
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              lum deſcribit, igitur tardiùs, haud dubiè Venus à Sole minùs digredi
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              videtur ad quàm Sol propiùs accedit, igitur in hoc caſu, maxima digreſ-</s>
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