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# Title: Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences (shelfmarks Leibn. Marg. 71; ZEN Leibn. Marg. 71)
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LS as Lo HC Cocurion oF chis FarHL eF ours, ic ) by cho lublequene deraction ot Comets, rheir Plains
is necesorily required chac chere Mould. be Scas,
chac frotn ehem ralt. quanciries of Vapours beins
may be inclined ro one anorter and disterent; a5
ris cerrain; de facto, chey noi are.
OE. Grepory in his Astronomia Phys. 6 Geometri-
ea Lib. 5. Mers, Thac ihie Anciene AArOnOMeFS
and Philosophers beliered Comets eo be very FC
centrical Planers rerolvine vound the Sun; ane
chat ic was che Peripaterick School Which bronxtie
ux the Norion os cheir beine nochine buc MeteOrS
and belon che MOOn.
Cassini obserred oF. the Comet ivhich appeared
inche Tear 268O, ThAF it WaS bUIE 22 Or 23 Deprees
trom che Sun, and yer eo us appear d eo hare halt
s
s Globe illuminared, Or nor to be cirher falcared
ox eibbous; Which al(o W 25 obserred BF the ComeL
in che Month oF Aprili 1665; arid Trom chence HC
concludes justly, thac chole Comers evere ae etar
eime ror only higher rhan ehe Mon bue also chan
rhe Sun himselF; because Mercury and VenS 2E
chac distance from che Sun do nerer appear tuil,
buc wrhen chey are lo.
The Came Person chinks ic is roo ram in the NIO
dern Philosophers ro condemn as false and. ridieu
Nous, che Norion rhar hach been long received ot
che bad Prelaxes etiComers; For he lairh, TF thre
Fail ot a Comet Mould be intermine led with our
Ainolphere, or it ehie Marter oF ic Tould; Dy ils
Graviey, FaII donn uxon our Parch, ic nioy in-
duce changes in our dir, that may be very sensI
Tite and Beins oF all chine, Comes chiessy trom ble amons Amiinal. arid Vegitable Bodies. Astron.
P. 408.
Anid p: 412. he Bews che ay ot dererminine
ihe Nay and apparene Place ot a Comet. And
runmins ouc ro aftord Marrer 1o produce che Tail, p. 418. From tour oblerred Places ot a Comet i0
the Sun) do sron more narrom and conrract. ana ac p. 42r. he sires che mechod ot determi
ed,; bur atcer chis, 25 the Comets recede From nins ehe erue Prajectory oF a Comet; AE p. 446.
them; and p. 447. 1o And che Inelinarion ot che
Plane ot the Comets Orbit ro chac of the Fcliprick.
jectory, and co derermine che Fleliocenrrick and
Geocentrick Place of ehe Comet in the Trajectori
decermined by che Nechod Belore given, tor any
siven Time; as allo co makre necessary Pables For
readilus sndins che Places ot Comers. FrOm p. 148
10 460.
The Famous Fames Dernoulli in his Systema Co-
Been sposteins, at equal distances trom ehe Sun metarum, An. 1682, Suppoles, Thac there is Tome
Ee concludes cheresore, hat Camers are a kind trom his vast distanee, or lnallHess nor 10 be vi
Sible ro us, bur homerer io have ae various di
sances troni him, several Sacellires movine round
tim (chouph none descendine (0 lon as ehie OrbiE
Ot Saturn) and chac chese becomine visble ro us
ivten ehies arc in chieir Perixaum, aec vnac ve
Call Comets.
COMTTATI es Castro Commisso, is a. Neir
Sturif
GOMTTACE Commisso, is L Wric, Or Coiri.
miltion, Whereby rhe Sherist is authoris d torake
uxon him che Command of che Courey.
COMITLALIS Morbus; the Pamie vich Fpi-
exsia.
COMMA, is one ot che Poines or ScopS aled in
railed by rhe Fleac ot che sun cher. may cicher
sacher inco Clouds, and elien Fall down in Rair
ro moisten and nourist the Whole Farih, and 1o
render it Ferrile; or. else (a5 some Philolophers
chintc ich sood reason) beins condensed. by ehic
cold. Pops ot Mounrains and Flilis run donn tron
chenee, and torm Sprinss, Lomcains, and Rivers;
(o lor the. Conservarion t ihe seas and Moisture
Ot, the Planors, Cometsileem necellarily requitie
from Whole Coemell fexhalarions and Vapours
2II char Moisture which is consumed in Vesitari-
ons and Purresactions, and curned into dry Parch,
a) . decrees be Comually. re supplied and re
cruied: FOr. all Vegirables do enctrelr pro ind
encreale trom Liquors, au uen as eo cheir ereat.
est parr do curn by Purrefaction inco dry larrh,
com ot. Pucretvins LiguorS. From hence the Ovan-
uey or Bulk ot dey Latiutaue concinually en
and a Slime perperually is precipitared ro che Bor
creale, and che Liquors or Moisture ot our Globe
continually decreale, and ac last be quire evapo
raled. and solc it cher hact Hol as concinual a Sup.
es lcom lome parr or orher ot ene niverle. Anc
1.40 allo lulpeet (laith our Au) char chac spi-
rit which is che sinest, subrillest, and best parr ot
oux Rir, and which is necellarily requisire ro etie
Comets
The Aemosphere oF Comets, as ther aced 1O.
wards ihe sun, are sensibly diministed: by Cheir
rigbely obserred che Phaenomona. Bur thoy appede
least oF all. wtien che Fleads oF che Ciomees havins
mets Peribelia) blaze oue inro those vastly prear
and brishe Minins Pails, and When the Nuolei be-
ins. perhaps corered vich a black chiek Smoak
are covered by the lorver parrs of the Aemosphere
For all Smoak is greater and mon Maba and
chick When theFlear is very preat.
Thus the Flead oF chac Comet of which le have
in November it was like one ot the First. or. Second. Orbis; ehis Prirriary Planet he suppoles cictiex
Ot Planets movins round ehie sun in very excenrri
cat Orbirs; and as chole Planers wrhich are near-
est the Sun, and revolve aboue him in lester: Or
biis,, are losser chan orhers, Poi he suppoles thcte
Comets Wtich in rheir Peribelion come. vers lea
the Sun, are lelsthan ochers, and letolre in lesser
Orbits
IF a Comet in irs delcenr ro, or alcent trom ttie
Sun, approach near co. a Planer a5 ic palles by;, Whereby che Charse ol a Counes, rogeitier wirt
ond irs elain be disserent srom chac in which che) che keexine ot a Casle is commiered 10 che
Planere move, by ies artractire Porver ic will. 2
Grecably. eo the universal Law oF Cravicarion oF
Bodies dran ic. from ehe Plain in wrhich ir betore
moved, and so cause ic afceruvard eo move i 
nem one, inclined ro the former, bur pans
chroveh che sun as che former did.
Pience ris possible, Thac. thouph elie Planers or
and leerrainty in chac pair which loots roards decermine irs Trajectory, il ic vere Rectilineat
the Sun, when they do noc eun our (o much he lhes hou co snd che Position of che Bodies ot
inco che Pail, cher aro enlarced, il Flevelius hach a Comers Orbir, and when che Comet will be in
been (o exceedinely heaced by che sun (in the Con And. atter ehis he Cers hou ce correct che Pra.
and che. Farrh axpeared more oblcure atrer rhe Primary Planer revolvins round che Sun in che
Peribetion chan betore. For in December ic appear- space oF 4 Vears and (57 Days, and ar che dictariće
ed bur like a Scar os ehe 3d Magnieude, Whereas trom him of 2583 Semidiameters of che Magnus
sinallys rerolved in che lame common Plain, zec) Vricinsi and ischus mashed (,) ane is chelentt