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# Title: [Astronomiae Physicae & Geometricae Elementa] Astronomiæ Physicæ & Geometricæ Elementa (shelfmark Leibn. Marg. 124)
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3. II.
Cut Fa
a pla
palese
cireu.
Iiple
Pitieo
lilgu
C11D
FerII
Patet
ete
IYI
NON
r1SI
licet
exV2
rbita
eribia
alte
ipet
eci
recta
ret
LC 2
TYSICA _ GEOMETRICA
 L. F M F. N T A.
ad eie
TII
De Cometis.
Xplicatis Planetarum tum primariorum cum secundariorum
motibus, e Phanomenis inde ortis, ad alterius seneris cor-
Porum nempe Cometarum motus explicandos progredimur, quo
rum plures species ab Auctoribus numerantur: illos quippe diri-
dunt secundum colores rarios quibus fulsere cernuntur, Planetal
que quos itaxmulantur, et Caudarum quas emittunt AsuraS. NVOS
qui Astronomica non AAtrolosica tractamus, horum unicum tan-
cum senus asnolcimus, qui pro divertitate raporis Caudam consti
tuentis, ipsusque Cometx litus respectu Solis, divertas iltas facies
octendunt.
In his tractandis primo Physica quaedam expediemus, ut ad Cico
metrica, ipsam nempe Orbitam determinandain, accedamus postea.
In Physicis tractandis opiniones quasdam de Philosophorum placita
Doltea rejicienda recensere necesse erit, ut amplectenda melius intel-
lisantur. Ouod aurem istud, in Libris praecedentibus consulto omil
sum, in hoc fiat, ignoscet Lector: neque enim Cometarum Theoria
Geometrarum curas hactenus adeo exercuit atque Fixarum Pla-
Ccarumque.
SFCTI
Creneralia de Cometis.
PROPOSTTTO I.
Dhilosophorum placita de Cometarum Duratione e Loco bre-
dier exponere.
Philosophi retustissimi iidemque Altronomi Cometas elle xterna
Mundi Corpora credidere, Planetarum instar, syros suos ctatis
temporibus complentia: Nam Aristoteles Lib. T. Meteor. C ap. 6. de
Cometa verba Faciens ait, Tcor S PCanrucor nres iy raersutcot FZa zopeicor, éra NE-
revon avror eiraet T ANArHTEI à épCV, ZM à N)Q. nOMOI re Zeerov d parraoiar aurs ciraq 
Y Nasepoonto 67 pIXsor, oEp ovuCapet i EEt  S FpuS areq. Italicorum autem
quidam vocatorumque Prthacoreorum dicunt Cometam esse unum
errantium syderum, se d non apparere nisi post multum tempus, nec
Ddd