that it is always to rife before the Sun, and that we may again 
fee it better, when it fliall rife betimes, towards the end of May, 
and in the beginning of June, if the cleernefs of the Day-break 
hinder us not; he thought it worth the while to try, whether 
the truth of this Ephemerider could be proved. 
He affirms then, that the Line defcribed by this Star refem- 
bles hitherto a Great Circle , as it is found in all other Comets in 
the midft of their Courfe. He finds the faid Circle inclined to 
the Ectiptique about 26. d, go', and the where it cuts it, to- 
wards the, beginning of Gemini and Sagittary : that it declines 
from the Equator about 76. d* and cuts it|towards the n . d. 
and confequeutly, that its greateft Latitude hath been towards 
Pijces , where it muft have been March 24. and its greateft pe- 
ctination, towards the 25. d , of the Equator , where it was to have 
been April it. 
He puts it in its Perigee March 2 7. about three of the Clock 
in the Afternoon, when it was about the 1 j\ degrees of Pifces , 
a little more Wefierly then March ah, or the Wing of Pegafus, and 
that it was to be in Conjunction with the Sun , April 9. Where yet 
he noteth, that according to another Calculation, the Perigee 
was March 27. more towards Night, fo that the Comet advan- 
ces a little more towards the Eajl^ and retards towards the Wejli 
which not being very fenfible in the firft days , differs more a- 
bout the end, and in the beginning ; which he leaves to Obfer- 
vation. 
He calculateth, that the greateft Motion it could make in one 
day, hath been 4. d. and or 9^ in one hour,about io', andi5". 
fo that its Diurnal Motion is to its left diftance from the Earth a 
little more than as 1. to 14. and its Hourly Motion, as 1 . to 5*30. 
He wonders, that it hath not been feen fooner ; the firft Ob- 
fervatious that he hath feen, but made by others, being of 
March 1 7. Whereas he finds, that it might have been feen fince 
January, at leaft in the Months of February and March , when it 
role at 2 of the Clock and before : becaufe it is very likely, that, 
confideringits bignefs and brightnefs, when it was towards its 
Perigee, it was.vifible, fince that towards the end of February it 
was not three times as much remote from the Earth, than when 
it was in its Perigee , and that towards the end of January it was 
not five times as much. In 
