Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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DE MUNDI
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SYSTEMATE</
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<
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>Deſignet jam
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PM
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arcum, quem Luna dato tempore quam
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minimo deſcribit, &
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ML
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lineolam quam Luna, impellente vi
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præfata 3
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IT,
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eodem tempore deſcribere poſſet. </
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<
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>Jungantur
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PL, MP,
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& producantur eæ ad
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m
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&
<
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l,
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ubi ſecent planum E
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clipticæ; inque
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Tm
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demittatur perpendiculum
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type
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PH.
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Et quo
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niam recta
<
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type
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ML
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parallela eſt plano Eclipticæ, ideoque cum recta
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<
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type
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"/>
ml
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emph.end
type
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quæ in plano illo jacet concurrere non poteſt, & tamen ja
<
lb
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cent hæ rectæ in plano communi
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emph
type
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italics
"/>
LMP ml
<
emph.end
type
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"/>
; parallelæ erunt hæ
<
lb
/>
rectæ, & propterea ſimilia erunt triangula
<
emph
type
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"/>
LMP, Lmp.
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"/>
Jam
<
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/>
cum
<
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type
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MPm
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type
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"/>
ſit in plano Orbis, in quo Luna in loco
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type
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"/>
P
<
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moveba
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/>
tur, incidet punctum
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type
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"/>
m
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type
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in lineam
<
emph
type
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Nn
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type
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per Orbis illius Nodos.
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<
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N, n
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dictam. </
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<
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>Et quoniam vis qua lineola
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type
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LM
<
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generatur, ſi
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tota ſimul & ſemel in loco
<
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type
="
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"/>
P
<
emph.end
type
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impreſſa eſſet, efficeret ut Luna
<
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/>
moveretur in arcu, cujus chorda eſſet
<
emph
type
="
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"/>
LP,
<
emph.end
type
="
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"/>
atque adeo trans
<
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/>
ferret Lunam de plano
<
emph
type
="
italics
"/>
MPmT
<
emph.end
type
="
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"/>
in planum
<
emph
type
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"/>
LPIT
<
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type
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; motus an
<
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/>
gularis Nodorum a vi illa genitus, æqualis erit angulo
<
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type
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"/>
mTl.
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Eſt
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/>
autem
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emph
type
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ml
<
emph.end
type
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ad
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emph
type
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"/>
mP
<
emph.end
type
="
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"/>
ut
<
emph
type
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ML
<
emph.end
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ad
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type
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MP,
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adeoque cum
<
emph
type
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MP
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ob da
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tum tempus data ſit, eſt
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type
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"/>
ml
<
emph.end
type
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"/>
ut rectangulum
<
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type
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MLXmP,
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"/>
id eſt,
<
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/>
ut rectangulum
<
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type
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"/>
ITXmP.
<
emph.end
type
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Et angulus
<
emph
type
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"/>
mTl,
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emph.end
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ſi modo angulus
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/>
<
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type
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Tml
<
emph.end
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rectus ſit, eſt ut (
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type
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ml/Tm
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emph.end
type
="
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), & propterea ut (
<
emph
type
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ITXPm/Tm
<
emph.end
type
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), id eſt,
<
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/>
(ob proportionales
<
emph
type
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Tm
<
emph.end
type
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"/>
&
<
emph
type
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mP, TP
<
emph.end
type
="
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&
<
emph
type
="
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"/>
PH
<
emph.end
type
="
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) ut (
<
emph
type
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"/>
ITXPH/TP
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emph.end
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),
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adeoque ob datam
<
emph
type
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"/>
TP,
<
emph.end
type
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"/>
ut
<
emph
type
="
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"/>
ITXPH.
<
emph.end
type
="
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"/>
Quod ſi angulus
<
emph
type
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"/>
Tml,
<
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type
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"/>
<
lb
/>
ſeu
<
emph
type
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"/>
STN
<
emph.end
type
="
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obliquus fit, erit angulus
<
emph
type
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"/>
mTl
<
emph.end
type
="
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"/>
adhuc minor, in rati
<
lb
/>
one ſinus anguli
<
emph
type
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"/>
STN
<
emph.end
type
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ad Radium. </
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>
<
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>Eſt igitur velocitas No
<
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/>
dorum ut
<
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type
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"/>
ITXPHXAZ,
<
emph.end
type
="
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"/>
ſive ut contentum ſub ſinubus trium
<
lb
/>
angulorum
<
emph
type
="
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"/>
TPI, PTN
<
emph.end
type
="
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&
<
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type
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"/>
STN.
<
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type
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</
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LIBER
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TERTIUS.</
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<
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>Si anguli illi, Nodis in Quadraturis & Luna in Syzygia exiſten
<
lb
/>
tibus, recti ſint, lineola
<
emph
type
="
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"/>
ml
<
emph.end
type
="
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"/>
abibit in infinitum, & angulus
<
emph
type
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"/>
mTl
<
emph.end
type
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"/>
<
lb
/>
evadet angulo
<
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type
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mPl
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æqualis. </
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<
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>Hoc autem in caſu, angulus
<
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mPl
<
emph.end
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<
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/>
eſt ad angulum
<
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type
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"/>
PTM,
<
emph.end
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quem Luna eodem tempore motu ſuo
<
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/>
apparente circa Terram deſcribit ut 1 ad 59,575. Nam angulus
<
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/>
<
emph
type
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mPl
<
emph.end
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="
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æqualis eſt angulo
<
emph
type
="
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"/>
LPM,
<
emph.end
type
="
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"/>
id eſt, angulo deflexionis Lunæ
<
lb
/>
a recto tramite, quem ſola vis præfata Solaris 3
<
emph
type
="
italics
"/>
IT
<
emph.end
type
="
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"/>
ſi tum ceſſa
<
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/>
ret Lunæ gravitas dato illo tempore generare poſſet; & angulus
<
lb
/>
<
emph
type
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"/>
PTM
<
emph.end
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æqualis eſt angulo deflexionis Lunæ a recto tramite, quem
<
lb
/>
vis illa, qua Luna in Orbe ſuo retinetur, ſi tum ceſſaret vis Sola
<
lb
/>
ris 3
<
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"/>
IT
<
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eodem tempore generaret. </
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>
<
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>Et hæ vires, ut ſupra dixi-</
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