Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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ad diametrum
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AB
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ut 100 ad 101: gravitas in loco
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Q
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in Terram,
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foret ad gravitatem in eodem loco
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Q
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in Sphæram centro
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radio
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PC
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vel
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QC
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deſcriptam, ut 126 ad 125. Et eodem argumento
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gravitas in loco
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A
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in Sphæroidem, convolutione Ellipſeos
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APBQ
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circa axem
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AB
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deſcriptam, eſt ad gravitatem in eodem loco
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A
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in
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Sphæram centro
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C
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radio
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AC
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deſcriptam, ut 125 ad 126. Eſt au
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tem gravitas in loco
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A
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in Terram, media proportionalis inter
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gravitates in dictam Sphæroidem & Sphæram: propterea quod
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Sphæra, diminuendo diametrum
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PQ
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in ratione 101 ad 100,
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vertitur in figuram Terræ; & hæc figura diminuendo in eadem
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ratione diametrum tertiam, quæ diametris duabus
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AB, PQ
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per
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pendicularis eſt, vertitur in dictam Sphæroidem; & gravitas in
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A,
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in caſu utroque, diminuitur in eadem ratione quam proxime.
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Eſt igitur gravitas in
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A
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in Sphæram centro
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C
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radio
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AC
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deſcriptam, ad gravitatem in
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A
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in Terram ut 126 ad 125 1/2, & gravitas
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in loco
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Q
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in Sphæram centro
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C
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radio
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QC
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deſcriptam, eſt ad gravitatem in loco
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A
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in
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Sphæram centro
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C
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radio
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AC
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deſcriptam,
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in ratione diametrorum (per Prop. LXXII.
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Lib. I.) id eſt, ut 100 ad 101. Conjungan
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tur jam hæ tres rationes, 126 ad 125, 126
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ad 125 1/2, & 100 ad 101: & fiet gravitas
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in loco
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Q
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in Terram, ad gravitatem in loco
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A
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in Terram, ut
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126X126X100 ad 125X125 1/2X101, ſeu ut 501 ad 500.
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DE MUNDI
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SYSTEMATE</
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<
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>Jam cum (per Corol. 3. Prop. XCI. Lib. I.) gravitas in canalis
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crure utrovis
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ACca
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vel
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QCcq
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ſit ut diſtantia loeorum a centro
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Terræ; ſi crura illa ſuperficiebus tranſverſis & æquidiſtantibus di
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ſtinguantur in partes totis proportionales, erunt pondera partium
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ſingularum in crure
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ACca
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ad pondera partium totidem in crure
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altero, ut magnitudines & gravitates acceleratrices conjunctim; id
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eſt, ut 101 ad 100 & 500 ad 501, hoc eſt, ut 505 ad 501. Ac
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proinde ſi vis centrifuga partis cujuſQ.E.I. crure
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ACca
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ex motu
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diurno oriunda, fuiſſet ad pondus partis ejuſdem ut 4 ad 505, eo
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ut de pondere partis cujuſque, in partes 505 diviſo, partes qua
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tuor detraheret; manerent pondera in utroque crure æqualia, &
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propterea fluidum conſiſteret in æquilibrio. </
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<
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>Verum vis centrifuga
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partis cujuſque eſt ad pondus ejuſdem ut 1 ad 289, hoc eſt, vis
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centrifuga quæ deberet eſſe ponderis pars (4/505) eſt tantum pars (1/289).
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