Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1tionalis, id eſt, qui ſit ad quatuor rectos, ut eſt tempus quo corpus
deſcripſit
arcum Ap,ad tempus revolutionis unius in Ellipſi. Sit
angulus
iſte N.
Tum capiatur & angulus D ad angulum B, ut
eſt
ſinus iſte anguli AOQad radium, & angulus E ad angulum
N-
AOQ+D, ut eſt longitudo L ad longitudinem eandem L
coſinu
anguli AOQdiminutam, ubi angulus iſte recto minor eſt,
auctam
ubi major.
Poſtea capiatur tum angulus F ad angulum B,
ut
eſt ſinus anguli AOQ+E ad radium, tum angulus G ad angu­
lum
N-AOQ-E+F ut eſt longitudo L ad longitudinem ean­
dem
coſinu anguli AOQ+E diminutam ubi angulus iſte recto mi­
nor
eſt, auctam ubi major.
Tertia vice capiatur angulus H ad an­
gulum
B, ut eſt ſinus anguli AOQ+E+G ad radium; & angu­
lus
I ad angulum N-AOQ-E-G+H, ut eſt longitudo L ad
eandem
longitudinem coſinu anguli AOQ+E+G diminutam,
ubi
angulus iſte re­
76[Figure 76]
cto
minor eſt, auc­
tam
ubi major.
Et
ſic
pergere licet in
infinitum
.
DeNI­
que
capiatur angu­
lus
AOqæqualis
angulo
AOQ+E
+G+I+&c.
e t
ex
coſinu ejus Or
& ordinata pr,quæ
eſt
ad ſinum ejus
qrut Ellipſeos axis minor ad axem majorem, habebitur corporis
locus
correctus p.Si quando angulus N-AOQ+D negativus
eſt
, debet ſignum+ipſius E ubique mutari in-, & ſignum-in+.
Idem
intelligendum eſt de ſignis ipſorum G & I, ubi anguli
N-
AOQ-E+F, & N-AOQ-E-G+H negativi prodeunt.
Convergit
autem ſeries infinita AOQ+E+G+I+&c. quam
celerrime
, adeo ut vix unquam opus fuerit ultra progredi quam
ad
terminum ſecundum E.
Et fundatur calculus in hoc Theore­
mate
, quod area APSſit ut differentia inter arcum AQ&
rectam
ab umbilico Sin Radium OQperpendiculariter de­
miſſam
.

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