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# Title: [Astronomiae Physicae & Geometricae Elementa] Astronomiæ Physicæ & Geometricæ Elementa (shelfmark Leibn. Marg. 124)
# Folio 407, page id 1040780814:0425
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Lib. V
EE GTEOMEZRTCA RLEMF NXA.
407
Tubnexis, Cometam rult ese corpus quoddam humidum proprios
suos vapores emittens, ethera semper pererrans, ad Solem eun-
dem semper fere situm retinens; quod e Frevelius tenet in lua
Cometoeraph. Pa5. 430. qui haud absimiliter Caudam productam
vult: nemDe Umosphaerae Cometicae partes tenniores vicaloris ra-
refieri,  à parte antica ac ab utroque latere propelli in partem
à Sole aversam. Ttisce positis, ex Grecorii lententia necessario se
quitur medietatem Cometae à Sole aversam, e ab illo nunquam
calesactam nec illustratam, crassis  valde opacis infestari vapori.
bus, qui à vaporosa illa Cometae materia continuo nutriti, nulla
unguam (ob debilem  obliguam Solis lucem, facta ipsorum reso-
lutione, in immensam altituainem excrescunt, Ce Solis racios non
satis validos ad exhalationes dispellendas undique reftectunt. Ce-
leberrimus D. Vervionus centet etiam quod Cometa Cauda nihil
aliud est quam vapor lonse tenuissimus, quem Caput seu Lucleus Co-
metae per calorem suum emittit.
Dum Cometa ad Perihelium suum descendit, rapores copiotiM
mi, qui illum in regionibus à Sole remotissimis ideoque Frisidis.
inis versantem prius insederunt, calore Solis rarefacti ascendunt;
hoc est, in partes à Sole avertas abcunt: nam particula omnes in
medio lonse ultra Saturnum protenso (aura Fc. atheria) graves
sunt in Solem. Aura haec, caletacta a calidis raporis parciculis
illi implicitis, carior e inde lerior Fit reliqud ambiente aurd, et
proinde ab hac provulsa sursum ascendit, unaque refsectentes par-
ticulas ex quibus Cauda componitur secum rehit; non absimili.
ter atque fumus ascendit in camino per impulsum aeris illum im-
plicantis per calorem rarefacti. Ouoniam vero ultra Cometa at-
mosphaeram aura xetheria est rara admOdUM _E FaNEUI nOn nUI-
la, ideo actioni radiorum Solarium particulas atOspharR CO.
metica secum rapientium a Keptero propugnata aliquid tribuam;
licet pracipuam maximeque efficacem alcensis vaporis Caudam
constituentis causam (peaeter impetum in primo ascentu acquisitum)
credam esse supradescriptam aura xtheria raritatem à calore par-
ricularum jusiter a Cometa acturgentium in ricinia Solis. uti
aura Cauda circumtusa dentior est d srarior. Atque Cauda tunc
in altum sublata, licut ipse Nucleus, in Solem graris tanquam
alterum projectile circa Solem in Coni sectione revolvitur, ac CO-
metam comitatur in resiones lonsinquas, donec paulatim dis-
SIPCtUI.
Ouamris Cometarum quorundam Cauda in immentum protensa
magnam materix copiami requirere videantur, qua illis producen
dis sufficiat; experientid edocti novimus in quantam tumi molem
Patis parva lisni aut carbonis fortilis portio abeat, e ex praemisso
Lemmate patet quam parra nostri Aeris portio in immensa spatia
vi sux elasticitatis diffundi queat. Fit licet Caudae non Cint usque
adeo rara textura, raristimas tamen elle, respectu corporum nobis
familiarium, exinde patet quod stella minima eas licet immensa
protum.