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# Title: [Philosophiae Naturalis Principia Mathematica] Philosophiæ Naturalis Principia Mathematica (shelfmark Leibn. Marg. 166)
# Folio 466, page id 1041163592:0502
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466
PTTTLOSOPEILLNATDRALIS
DEMONDI OO. Fan. 13 C auda luce Paris sensibili cerminaBAEUE inECE Ala-
mech et Alcol, e luce renuistima delinebat c resione Aellae x in
latere Persei. Distantia termini caudxe a circulo Solem ec C ome-
Eam WIGENEC CFAL 381. 50, e inclinatio chordie caudie ad circu-
Jum illum 825. Fan. 25 8c 26 luce cenui micabat ad longieu-
dinem gradtuum 6 vel 7; dc ubi caelum valde serenum crac, luce
tenuissima de aegerrime sensibili actingebat lonsicudinem gradtuum
duodecim e paulo ulera. Dirisebatur autem ejus axis ad Luci-
dam in humero orientali Aurisxe accurare, adeoque declinabat ab
oppositione Solis boream vertus in angulo graduum decem. De-
nique Feb. 20 Caudam oculis armatis alpexi gradus duos lon-
am. Nam lux praedicta renvior per ritra non apparuit. Pon-
thauS auTem Feb. 7 se caudam ad longitudinem graduum 12
vidisse Ccribit.
Orbem jam deseripeum spectanti ex reliqua Cometae hujus Phx-
nomena in animo revolrentis haud difticulcer constabit quod cor-
pora Cometarum sune solida, compacta, sxa ac durabilia ad in-
Ttar corporum Planctarum. Nam si nihril aliud eslene quam vapo-
res vel exhalationes Terrae, Solis et Planetarum, Cometa hicce in
transieu suo per riciniam Solis stacim dissipari debuisset. Es enim
calor Solis ue radliorum den(ItaS, hoc eR, reciproce ut quadratum
distantiae locorum a Solc. Ideoque cum dictantia Cometx a cen-
tro Solis Decemb. 8 ubi in Perihelio versabatur, esset ad distan-
tiam Terra a centro Solis ut 6 ad r000 circiter, calor Solis avud
Cometam eo tempore crat ad calorem Solis aestivi apud nOS uE
20000002d 26, Teu 28000 ad T. Scd calor aquae cbullientis cAt
quasi criplo. major quam calor quem terra arida concipie ad aesti-
rum Solem, AE eXDCrEUS TUM: SC Calor Ferri candencis (si recte
conjector) quasi eriplo vel quadruplo major quam calor aquae cbul-
lieneis; adeoque calor quem cerra arida apud Cometam in Peri-
helio versancem ex radiis Solaribus concipere poster, quasi 2000
vicibus major quam calor ferri candentis. Panco autem calore
raxores ex exhalationes, omnisque maceria volatilis ctatim consumi
ac dissipari debuissent.
Comcta igitur in Perihelio suo calorem immensum ad Solem
concepit, ex calorem illum diucissime conserrare potest. Nam
slobus terri candentis digicum unum latus, calorem suum omnem
spatio hora unius in aere consistens rix amitteret. Globus auTem
major calorem diueius conserraret in ratione diametris proprerea
quod superticies (ad cujus menturam per contactum aeris ambi-
entis
DXSPF M RF