205

%

A

S T R 0 N o M Y*

^spher °s t ^ lc ' r Tails taken off, and that of the At-K lift O a ^ ate ^ by being magnified. The, Nucleus of0 ^eas o^ot measured but a few Seconds, as I found“kinu. 7, Urin g the Atmosphere by a Micrometer, aud

7. 0 I pr J“ portional Part -

o e Ptoverf e 0t ' ncr band, by their annual Parallax they1 'I als 0 t0 ^ibend within the Regions of the Planets ;Ca lly - a Ppear sometimes dlreSl and slower than theyJVf 0 ?- Ve ' sometimes retrograde and swifter than the** and lastly, they are sometimes stationary v

r ^ r e b'bænomena arise from the fame Causes asCx P^ a ’ nc d of the Planets. (See Annotation

c- S

^ f| b e ~^ Ce the Comets by Observation are found to de-J s Q: r. e t> Ve Li " e s about the Sun, they must be drawnh ^°tio ° rCe L° m a rectilinear Course by the first LawAnd since this Force in all the Planets55% 5 ^un, as being the largest Body in the Syf-

ia a re s°te also this Force in the Comets respects the« ?P it .,^ore immediate Manner as being so much lessh' 8 P 0r at \ most of the Planets are. And lastly, as5 tU c e i n tjjg pi anets i s i n versely in the duplicate„ - Distance from the Sun, the seme Law is

^d-V^Iv

llh °f tk le rianets IS lnveiuay m intK°Pbt j. Distance from the Sun, the seme Law ises„., e dli' obTer-ved by the Comets, which are in otheries similar to the Planets. The Comets

e ‘PeA observed by theSef^Sodie, similar ton °ir J'q . m °ve i n Conic Sections about the Sun, havingV 9 . fp 1 !st the Sun’s Centre. (See Annot. CXL.)

L* s Piust'e 6 ’ if Comets return in an Orbit, those Or-0, > th e and their Periodical Times will

th ‘Pi'cateT' riodic “ 1 Times of the Planets in the fef-(W '■ at io of the principal Axes: And therefore\l bein S f or the most Part beyond the P!

iane-

CV>ieh nS ’ a nd on that Account describing Orbits( j°Wly. ^“ larger Axes than the Planets, revolve more5 S 1 f bus if the Axis of a Comet’s Orbit be 4lr, ie 0 f as that of Saturn’s Orbit, then would thev l Li 6 period of the Comet be to that of the Pla~

V4V

*o.

4 to 1, or as 8 to 1, viz. 8 X 30 = 240

IjT Orbsi Ce L i J found by Observations that the Come-^ CXCrcm ely eccentric, and that the Por-

* Lomet describe* during the whole Time of

its