r 274 ) 
ikk^ in the Morning appearance did not exceed three/ de- 
grees, but in apparitione Vefpertina^ the Awj^fe was abov^ 
28 and almoft 29 degrees, its Nodtfs Auflraiu wzs zccoifd" 
ing to thQ ^man Obfervatioa in 8 degrees of Z,?^r«, but 
afterwards its Kodus Eoreus in 18** 19' Sa^ittarij^ and by 
this reafon and its Diur?tal morion, the Comet pafled by the 
in a diftance of II degrees, juft when the fhorteft 
day was in the year : its ProgreJJion being firft flow but from 
the Su7i much increafed andfwifcer. Concerning the The- 
ory or figure and line oi us motion, he faith, that neither an 
Arch oi a great, nor lefTer Or^/^> nora ftrait line wiH do 
the bufinefs^ but rather a certain crooked line turned 
after an infleBion like a ^^r^m^which never yet was known 
in any oxhti Comet; or it muft be fuppofed^ that two dif- 
ferent Comets have appeared, one in the Morning, and a- 
nother in the Evening,as Mr. Caffini doth conclude^tho the 
Author himfelf is perfwaded by the knalogy oitht motion^ 
quoad Longitudinem^ that only one and no more appeared 
at that time its Tail being in the Morning direfted to- 
wards the Weft hut in the Evening to the Alfothe 
feventeenth of December its Tail feemed to be divided into 
two parts, trom the bottom to the top, by a blac^firoa/^ 
pafling through the middle. The length being fometimes 
of Sixty, and the bredth of four degrees. About the fub- 
ft ance and original caufe of ^o;;?^^/, he hath no mind to lay 
any thing, as being doubtful what they truely are, the 
difpuce of their P^r/aj&:v not being yet fully decided, and 
fo of their matter whether jEthereal or Elementar , the 
g^ueftion not refolved. But to fliow the agreement of this 
Comet with others that have been obferved, hehathcom- 
pofed a convenient Table, containing a Lift of z\\ Comets, 
that ever have been defcribed by Hifiorians znA hflrono" 
mersy putting down firft, the year before ov zittY Chriji 
when they have appeared. 2. The Place or Country 
where they have been feen. 3. The Ai5^^^(?r/ which have ! 
made mention of them. 4. The or time of the year | 
when |i 
