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# Title: Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences (shelfmarks Leibn. Marg. 71; ZEN Leibn. Marg. 71)
# Folio - , page id 806933011:0202
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(omerimes eo more Rover, and ocher rintes more .Thien he procceds to consider more parriculari
Evitely.
IF che Farrh move the fame vay wich the C0
mes. and sviscor by its angular Morion round che
What the Bodies ot Comers are, ard concludes cha
cher are solid, compact, fire and durable, litre
thole oF che ocher PlaterS. Returins che old Opi
Sun, chani ihC Comet, ihe Comet ertien boheld scom nion ot cheic beins Mereors or Fxhalarions, Trom
rhe Larch wvill appear eo be Rerroerade.
And it the Fartk move Noner chan ir, ehe MIO
cion of che Comet (subducting che Norion oF ihe
Karch) vill Be, eo appearance, AOver.
chis; thac in cheir Pransies (0 near che sun as we
And etier do e0, cher voula bepertectlys dissipa
ted, dispersed and destroyed
THCFCaE OE che Sun he hadt Betore Meron 1o be
Bur iC ihe Karrh mOve a Conrary Way co che as the Densry of che RayS; or ReciprocallY aSChC
Comet, it will chen appear ro more lwister than Squares of rhe Distances ot Places trom che sun
he Farch: AI wrtich he illustrares and proves, Wheretore lince he Dittance ot the Comet which
and Mens also 2 may scom che Comet s Parallax 10 axpeared in ihe XCar 1680, beins in irs Peribeli-
sind ies distance.
on December the Sch, vas then ro che Distance ot
From ehe Consideration also oF the Curricy ot ihe Farrh from che Sun a56 10 r000 nearly. The
che may ot a Comet, he concludes, chac when chey Suns Elear in che Comet ac chac cime was co his
dilappear they are much belon che Orb ob Fupi-
Freac wich us ac Midsummer 25 10000001036 01
per; end chac in cheir Porizeums and Periheliums 2800010 r; Whereas the Fleat ot Boiling Wacer
cher oscen descend belon che Orbirs oF Mars and as he cried, as buc very lirele more chan eripple
che Inferior Plancts.
cheElear et our dey Parch exposed ro che Mid
Erom ihe Lieht al(O OE the apPATenE ScaE Thar summer sun; and che Fleat oF red hor Tron he con-
is in ee blead ot ine Comet, he concludes cheir
jectures ro be abour Z Or 4 rimes as greac as chat
Viciniey eo ehe Sun and Darch, and char ches can ot boisins Wacer: Wheretore che Hear ot che
by no menns be in lho llexion ot ehie fix d Scars.
as some have imagined; for then cheir Feads
dried Parch or Body oF che Comet in iis Periheli.
on, WaS near 2000 cimes 25 prear 25 chac oF red
conld no more be entiphrened by che sun, chan hoc Tron; and consequencly, it the Comet hac
cho elaners are by che AX d StarS.
Considerins allo che Obscurarion oF the Come
by chac chick Fume or Vapour wich wrhich ies
lead is alvays encompassed, he concludes, that
cher must oscen deseend donn belon che Sphere
et saturn as he had betore Found by rheir Paral-
JaX. The same chins he concludes also by exami-
been a Meceor or an ABxrepare ot Vapours and
Extalarions, che dun voula soon have rendredie
invisible.
That Comet theretore acquired (0 Preat, (oim
mense a degrec ot Flear in irs Perihelion, chac il
must needs De a lons rime betore ic will be colda
fain; tor he compures chac a Globe or red hoc
nins into che cause oP ehe Coma or Fail, and then tron, of che Dimensions of our Farth mould scarce
drans chele Corellaries.
1. Thae Comers Minc D) the LighE oF the Sun
Beams rellelted from chem.
2. LHaL IHC LCareH aIC deroid oF aII RCF.
stance, Cuch as our Air and ortier Mediums have
For chele Comors move every vay wich aI che
freedom thar can be, obliguely, directly, and olter
against rhe course oF the PlaneES, and yeE Can COn
rinue cheir Mocion for a very lons wrhile, even (0
And cherelore ehe Celestial Resions cannor b
Alled Wirh Mlarrer likre che Carrestan Vorrices, bur
must. be almost void Spaces.
Aext II Fropos. 40. 600k S. he proves, Tha
Comets move round che sun in Conick Sections
havins cheir Umbelici in the Cenere oF che Sun;
and chac by Lines drawn trom chemselres eo che
Sun they describe Areas proxorrional to cheir
Limes ot Rerolurion, as the other Planers do.
And he scems eo china chem a Kind ot PlaHCES,
and chac chey rerore in teal Elliprical Orbits,
be cool in 50000 Tears. IE cheretore me suppole
ehe Comet eo cool 100rimes a5 fast as red hor Iron
char ot red hor Tron, il rou suppose his Body u
beoF che lame bixness ot our Farth, he will not be
Ele obserres also, thac che Tails OE all Comet
are lonxest and largest asrer their parrine trom che
Sun, or just after cheir Peritelions; which Mews
thacche Suns Fleac concribures ro the encreale of
che Tais, whence ris more chan probable, chac
che Tail ot a Comet is only a lons and very chin
Smcak or erain ot Vapours which che ieniced Nu-
cleus, or Flead ot che Comer emirs trom ic. And
chis Norion he contirms atcer chis, by returing che
cvo ocher Opinions abour che Orixin of che Pail
For some ili have il ro be only che Sun- Deanis
Minine chrough che Flead oF the Comet a5 they de
chrouxh 2 Crerise inco a dark Place, and by char
Which ebpolirion he concludes,
vec cince his FPear was 2000 cimes preater char
cool in a Million oF XearS.
et a Comet.
Thac is Comets do erer come abour again, cause the ReaION LHaL IHE SUIN- BeamS ApPCAF thuS
Their Orbirs are very Eccenericat Ellipses; and lucid wrten his Rays ine chrouph an Fole or
thac r:ir Periodical Limes are co chose ot cheFla
Chinke inco a dark place, is because the lixhr is re
hers in 2 Selquialceral Racio ot che Franfverle Aected tront n Las Ot SIIOAR, LIIIAI Su
AXeS, ana lCIOre Conrs ume usually above
C9c. Which concinually Ay r0 and From che Air,
ehe Planers, and describins Orbirs ot longer Ares and cheretore lo alvass  speneet Wnere i
chan chey, doreally move Dorver chan chey; and
particulart), Chac it che Ax ot the DOF a Comet, ber ot Parricles oF chis NPature. Duc s a Cm att
de ot che Rerosucion e ne Lomet, ro chal and consequeney in the Celestial Rexions irhere
noc be visible: Lior Lighe, as in che Sun- Beams
et ehis in several Lemmas he prepares chesonly, is noc discernable, bur only (0 tar a5 il is
id determine che species ot ile Cnen Secii-(trom chence reffected ro ourRiyes
Orhers will have che lails oF Comets ro be
ce siven Time; and 1o oclesme che formed by the Retraction ot Liphe as ic pastes
hry om chrec Obleeraltons, Wnich he il. s chroueh che Head ot che Comet co che Farrh: Buc
means come lo apeCat s Cac LeMI.
Bur chis Norion he Mens ill noc hold; De.
Air abounds wich che most erols and grearest num
vere a ritmes as lons as the Ax ol Sacurns Orbit, clearer Air, no tuch Appearance can well be seen:
ESacuch uouta be 25 4 XY 4 OF B 10L; chac is, probabiy chere is liele or no Marcer 10 restect, can
Comet deseribes; eo Anct ies place ae any in.
eo by Fimamples.