Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1agendo, propius accedent ad corpus T,& celerius movebuntur
in Conjunctione & Oppoſitione ipſarum & corporis S,quam in
Quadraturis.
Et Nodi Annuli hujus ſeu interſectiones ejus cum
plano Orbitæ corporis Svel T,quieſcent in Syzygiis; extra Syzy­
gias vero movebuntur in antecedentia, & velociſſime quidem in
Quadraturis, tardius aliis in locis.
Annuli quoQ.E.I.clinatio varia­
bitur, & axis ejus ſingulis revolutionibus oſcillabitur, completaque
revolutione ad priſtinum ſitum redibit, niſi quatenus per præceſſi­
onem Nodorum circumfertur.
LIBER
PRIMUS.
Corol.19. Fingas jam Globum corporis T,ex materia non fluida
conſtantem, ampliari & extendi uſque ad hunc Annulum, & alveo
per circuitum excavato continere Aquam, motuque eodem perio­
dico circa axem ſuum uniformiter revolvi.
Hic liquor per vices
acceleratus & retardatus (ut in ſuperiore Corollario) in Syzygiis
velocior erit, in Quadraturis tardior quam ſuperficies Globi, &
ſic fluet in alveo refluet que ad modum Maris.
Aqua revolvendo cir­
ca Globi centrum quieſcens, ſi tollatur attractio corporis Snullum
acquiret motum fluxus & refluxus.
Par eſt ratio Globi uniformiter
progredientis in directum & interea revolventis circa centrum
ſuum (per Legum Corol.
5.) ut & Globi de curſu rectilineo uNI­
formiter tracti, per Legum Corol.
6. Accedat autem corpus S,
& ab ipſius inæquabili attractione mox turbabitur Aqua.
Etenim
major erit attractio aquæ propioris, minor ea remotioris.
Vis
autem LMtrahet aquam deorſum in Quadraturis, facietQ.E.I.­
ſam deſcendere uſque ad Syzygias; & vis KLtrahet eandem ſur­
ſum in Syzygiis, ſiſtetQ.E.D.ſcenſum ejus & faciet ipſam aſcendere
uſque ad Quadraturas.
Corol.20. Si Annulus jam rigeat & minuatur Globus, ceſſa­
bit motus fluendi & refluendi; ſed Oſcillatorius ille inclinationis
motus & præceſſio Nodorum manebunt.
Habeat Globus eundem
axem cum Annulo, gyroſque compleat iiſdem temporibus, & ſuper­
ficie ſua contingat ipſum interius, eiQ.E.I.hæreat; & participando
motum ejus, compages utriuſque Oſcillabitur & Nodi regredien­
tur.
Nam Globus, ut mox dicetur, ad ſuſcipiendas impreſſiones
omnes indifferens eſt.
Annuli Globo orbati maximus inclinationis
angulus eſt ubi Nodi ſunt in Syzygiis.
Inde in progreſſu Nodo­
rum ad Quadraturas conatur is inclinationem ſuam minuere, & iſto
conatu motum imprimit Globo toti.
Retinet Globus motum im­
preſſum uſQ.E.D.m Annulus conatu contrario motum hunc tollat,
imprimatque motum novum in contrariam partem: Atque hac ra-

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