Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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NI­
ES
.
Motus quidem veros corporum ſingulorum cognoſcere, & ab
apparentibus
actu diſcriminare, difficillimum.
eſt propterea quod
partes
ſpatii illius immobilis, in quo corpora vere moventur, non
incurrunt
in ſenſus.
Cauſa tamen non eſt prorſus deſperata. Nam
ſuppetunt
argumenta, partim ex motibus apparentibus qui ſunt
motuum
verorum differentiæ, partim ex viribus quæ ſunt mo­
tuum
verorum cauſæ & effectus.
Ut ſi globi duo, ad datam ab in­
vicem
diſtantiam filo intercedente connexi, revolverentur circa
commune
gravitatis centrum; innoteſceret ex tenſione fili cona­
tus
globorum recedendi ab axe motus, & inde quantitas motus
circularis
computari poſſet.
Deinde ſi vires quælibet æquales in
alternas
globorum facies ad motum circularem augendum vel mi­
nuendum
ſimul imprimerentur, innoteſceret ex aucta vel diminuta
fili
tenſione augmentum vel decrementum motus; & inde tandem
inveniri
poſſent facies globorum in quas vires imprimi deberent,
ut
motus maxime augeretur; id eſt, facies poſticæ, ſive quæ in mo­
tu
circulari ſequuntur.
Cognitis autem faciebus quæ ſequuntur,
& faciebus oppoſitis quæ præcedunt, cognoſceretur determinatio
motus
.
In hunc modum inveniri poſſet & quantitas & determi­
natio
motus hujus circularis in vacuo quovis immenſo, ubi nihil
extaret
externum & ſenſibile quocum globi conferri poſſent.
Si
jam
conſtituerentur in ſpatio illo corpora aliqua longinqua datam
inter
ſe poſitionem ſervantia, qualia ſunt Stellæ Fixæ in regionibus
noſtris
: ſciri quidem non poſſet ex relativa globorum tranſlatione
inter
corpora, utrum his an illis tribuendus eſſet motus.
At ſi

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