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# Title: [Philosophiae Naturalis Principia Mathematica] Philosophiæ Naturalis Principia Mathematica (shelfmark Leibn. Marg. 166)
# Folio 469, page id 1041163592:0505
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MIIPIII
PRINOIDTA MATTIEMATTCA.
Planis Orbium Cometarum per Solem transcuntibus jacentes, de-
viane ab oppolicione Solis in cas semper partes, quas capita in
Orbibus illis progredientia relinquune. Quod spectatori in his
planis constituro apparene in partibus a Sole directe aversis; di-
grediente aurem spectatore de his planis, deviatio paulatim sen-
citur, e indies apparet major. Quod deriatio exteris paribus
minor est ubi cauda obliquior ett ad Orbem Comete, ut ec ubi
caput Comerx ad Solem provius accedic; praesertim A spectetur
deriationis anoulus juxta capue Cometx. Praeterea quod caudie
non deriances apDaFeNE rectR dCVIANECS aUTEM INCVEVANEUE. Duod
curratura major est ubi major cA deriatio, ex magis sensibilis ubi
cauda caeteris paribus longior est: nam in brevioribus curratura
ceore animadvercitur. Quod deviationis angulus minor est juxta
CapuE Cometae, major juxta caudae extremitatem alteram, acque
2deo quod cauda convexo lui latere partes relpicie a quibus He
devintio, quaeque in recta lunt linea a Sole per caput Cometae in
infinicum ducta. F.t quod caudae quae prolixiores (unt ec latiores,
et luce vegetiore micane, sint ad latera convexa paulo splendi-
diores et limice minus indistincto terminatae quam ad concara.
Pendent isitur Phaenomena caudae a motu capitis, non autem a
regione caeli in qua capue conspicitur; e propterea non Hunt per
retractionem calorum, sed a capite suppeditante maceriam ori-
untur. Etenim ut in Aere noctro cumus corporis cujulris igniti
petie superiora, idque vel perpendiculariter E corpus quielcat,
vel oblique si corpus moreatur in latus: ita in Calis ubi corpora
graritant in Solem, Fumi de rapores ascendere debent à Sole (uri
jam dictum. CAt) ec superiora vel recta peterC, _ COrpUS FUmaNS
quiescie; vel oblique, s corpus prosrediendo loca semper deserit
a quibus superiores raporis partes alcenderane. Ec obliquiras ilta
minor erit ubi alcensus raporis relocior cA: nimirum in vicinia
Solis ex juxta corpuS Fumans. Ex obliquicatis autem diversitate
incurrabitur raporis columna: ex quia rapor in columnee latere
praecedente paulo recentior eAt, ideo etiam is ibidem aliquanto
densior erit, lucemque propterea copiolius reflectet, ec limite mi-
nus indistincto terminabitur. De Caudarum agicionibus Cubita-
neis ex incertis, deque carum Aguris irregularibus, quas nonnulII
quandoque describune, hic nihul adjicio; proprerea quod vel a
mucationibus Aeris nostri, ex moribus nubium caudas aliqua ex
parte obscurantium oriantur; vel Forte a partibus Via Lactex,
quae cum caudis praetereuntibus contundi pontine, ac tanquam ca-
rum partes spectari.
Vapo.
MIMIIII
1
46
L. IBEK
TEKXIDS.
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