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# Title: [Astronomiae Physicae & Geometricae Elementa] Astronomiæ Physicæ & Geometricæ Elementa (shelfmark Leibn. Marg. 124)
# Folio 409, page id 1040780814:0427
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10.
phaera
TIMad
entud
15 P0
LIMO
prout
510
qualla
exiito
inima
I
rariti
1011
ostia
1
iut
1
olo
_E GF OMETRLCAE F, LEMENLA.
409
conrerum erit, sequens rero carum, iplaque proinde Cometa
Cauda non erit à Sole praecise averta, immo nec directa sed
incurrata. FF haec a Solis opposito deriatio _ curratura tan-
to minor est quanto recta Solem e Cometam conjungens obli-
quior est ad Cometa semitam: Nam si Cometa dircele a Sole vel
ad Solem tenderet, Cauda foret à Sole directe averla d ipsa recta;
unde in ipso Peritelio Cauda maxime ab opposito Solis deslectit,
maxime etiam incurratur, cum recta Solem es Cometam conjun
SenS sit tunc ad ejus Orbitam perpendicularis. Sed e ob Cupra-
dictam atheris resistentiam, utut exiguam, conrexa (hoc est, in
XthereM INCUEFONS) Ciauda Facies Spiltior aliquanto et consequenter
lucidior videbitur e melius terminata quam cara, a qua lucem
resectentes particula, relicta quasi, in athera diffunduntur.
Porro, haec Caudae deriatio à Solis oppolito d incurratio (eare-
ris paribus) major cs propter utramque causam praedictam ubi
Cometa Orbita currior cA: Nam ut Ciauda sit à Sole Derpetuo a-
versa in hoc casu, oporteret ejus extremum circumterentiam exte
riorem ex majorem describere quam ipsum Caput, quod ex motu a
Capite participato facere nequiret, quamris nulla Foret atheris re-
Fictentia qua illum minueret. Cauda isitur extremum à Cometa
remotissimum, quia circumserentiam ictam majorem tam brevi tem-
Pore non de seribit atque Caput minorem, idque ob duplicem quam
explicuimus rationem, magis in hoc casu incurrabitur. Sed cum
catus hic incidat in Cometx Perihelium, ubi Cauda prius in altum
sublata cranuit sere, et qui recens recta altursit rapor Caudam
praecipue constituit; ideo non tam sensibilis erit incurratio.
GiOROLLARTUM 4.
Fioura COrol. praec. descripta rCtOrE Caudam qUR FCVCrA per A
therem à Cometa Capite porrisitur; quo non obstante, si Perra d
timul Spectator in Orbis Cometae plano reperiatur, Cauda Curra-
cura neutiquam percipietur, quia tota in plano ilto jacet: let vel
tota disparebit cum ipsum Caput Caudam inter ex Oculum versa-
TUT, vel Si Caput minus fuerit et Cauda rersus alterum extremum
latior, Crinitus sire Comatus erinibus circumquaque cinctus vide
Ditur. (atque horum alteruerum sub Oppolitionem Solis ec Cometa
Continget,) vel denique in Solis oppolito pracile spectabitur C’auca.
Si vero Spectator extra planum Orbita Cometica versetur, Cauda
curratura sentietur; magisque sensibilis cradet, quo recta a Terra
ad Caudam ducta Orbis Cometa (iptiusque adeo Ciauda) plano ma-
sis est normalis, _ omnia curra Cauda symptomata CoroII. PTaC.
descripta sensibiliora Hent. Atque ha sunt stata et Tolennes Ciauda
Cometa mutationes: nam quantum ad incertas istas dt subitaneaS.
quas Auctores memorant, ortae videntur a raporum AtmosplX.
ea nostra retractione fortuita Caudarum figuras detorquente; vel
a mocu nubium illas aliqua ex parte obscurantium; aut a vicinis
Scellisharumre conserie, aut Via Lactea pro Ciauca parte perperam
Cumptis.
L Ib. V