A

we

STRONOMY.

have f — •

kri

' J 365,2,565

a ’so the other Expressions will t

’''Cihol . . enrSoArnnCor V n

■ = 0 . 0027378 .

become for the

W Axis , = S2!™miU2L‘__, miSm the

r"/\ r Vo^ r«/\ r“ •! i» « -Z * *' '

H

‘cal T

591826599535 ■

4750560000 X « ■

ime t =

.44.tr 591826599535-

Jhd e r jl en . ce it appears, that it Observations could bec ‘ e ntly exact to determine the Distance of ther he Space it moved over in its Orbit in one‘i:i»i e en the Axes of the Orbit and the Periodicalthe Comet may as well He computed as thoseN of anet 5 but this is a Matter of the greatest Nicety,x‘ l ^ §teatest Difficulty, because the r//rMchornet, if it be such, can scarcely be dif-^ Observation (however well made) fromf Co lca i Orbit, in all that Part of the Orbit whichU e e * describes during its Appearance. Hence?> or tlt y a e 1 will generally come out either equal ■t ? gi v e ^ r ^ ater than the Number 591826599535, andAxis* infinite or negative ; And if it chance,°t dec ° e than the said Number, then is a or t be>N ^ Qe d to the last Degree of Exactness, the Axis x,ttitjj ri °tiical Time t, will be very different from thef * 5 - A D Ut more t ^ is ‘ n mother Place.

^ sll ^ Parabola therefore is fully sufficient to accountjy^iotj ? Circumstances and Phænomena of a Comet’sftw the Time of its Appearance ; as Sir IsaacOf ” 'with respect to the Comets'of 166 . , 1680,

* 3 i 1723,' and Mr. Bett's for the last Comet

^tid that the Reader may fee the wonderfulPq, 1 , 11 between the Theory (though grounded onft Ne" a °! tca l Hypothesis) and the Phænomena of Eon-jyl| hg^.b-atitude of the Comet by Observation, It “^pm ^.^bjoin a Table exhibiting the fame both byfc ^ th 'ou and Observation, and the Differences bp-tVl lip n Cm ‘^erally for each respective Time of Ob-