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# Title: [Philosophiae Naturalis Principia Mathematica] Philosophiæ Naturalis Principia Mathematica (shelfmark Leibn. Marg. 166)
# Folio 441, page id 1041163592:0475
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IIIIII
PRINOIPTA MATHEMATICA.
Idem colligitur CX CUFVaTTA viX COMCFArUM. PErGUNE BXC LHEN
corpora provemodum in circulis maximis quamdiu moventur celc- FexxiVS.
rius; aE in finc cursus, ubi motus apparentis pars illa quae a pa-
rallaxi oritur, majorem habet proportionem ad Otum torum ap
Parentem, desectere solent ab his circulis, ec quories Terra mo-
vecur in unam parcem, abire in partem contrariam. Oritur hec
desexio maxime ex Parallaxi, propterca quod respondet motui
Perrx; ec insionis ejus quantitas, meo compuro, collocarie dilp2.
rentes Cometas Paris londe intra Jorem. Inde conteguens cst
quod in Perioxis ec Periheliis, ubi propius adsunt, descendune
laepius intra orbes Mlartis ec inferiorum Planetarum.
Contrmatur etiam propinquitas Cometarum ex luce capitum.
Nam corporis calestis a Sole illustrati ec in regiones longinquas
abcuntis, diminuitur splendor in quadruplicata ratione diltantix:
in duplicaca ratione videlicet ob auctam corporis distanciam a
Sole, ex in alia duplicata ratione ob diminuram diamerrum appa-
rentem. Inde si detur ex lucis quantitas ec apparens diameter
Ciometaes dabitur distantia, dicendo quod distantia sc ad distan-
eiam Planetae, in ratione diametri ad diametrum directe ex ratione
(ubduplicara lucis ad Jucem inverse. Sic minima capillicii Co.
metxe anni 2682 diameter, per Tubum opticum sexdecim pedum
a Flamstedio obterrata ex Micrometro mensurata, aequabat 2.0.
Nuslens aurem seu stella in medio capitis vix decimam parcem la
citudinis hujus occupabat, adeoque laca crat tantum LI vel 12.
Fuce vero ex claritate capiris superabat CaDuE C Ometae anni 1680,
Stellasque primae vel secundae magnicudinis xmulabaeur. Ponamus
Sacurnum cum annulo suo quasi quadruplo lucidiorem fuisse: e
quoniam lux annuli proxemodum aequabat lucem globi inter-
medii, e diameter apparens globi sit quasi 21, adeoque lux
globi ec annuli conjunctim aequaret lucem globi, cujus diameter
CNeE 30: erit distantia Cometae ad distanciam Saturni uE + ad VA
inverse, e 12 2d 30 directe, id cA, ut 24 2d 30 Ceu 4 2d 5.
Kursus Cometa anni 1665 mense Aprili, ue auchor cA Flevelius,
claritate sua Dene Fixas omnes superabat, quineciam ipsum Satur-
num, racione coloris videlicet longe viridioris. Ouippe lucidior
exat hic Cometa altero illo, qui in tine anni praecedentis apparu-
erat ex cum Rellis primae magnitudinis conterebatur. L acitudo
capillitii eraE qua 6 at nucleus cum Planetis ovc Tubi optici
ColatuS, PlanC MINOT CTAE SOVE, EC MUINC MIMOE COrPOrC interME
dic
sat
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