(38) 
that it is always to rife before the SuHj 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 5 he thought it worth the while to try, whether 
the truth of this Ephemerides could be proved. 
. He affirms then, that the defcribed by this Star refem- 
bles hitherto a Gr^at Circle^ as it is found in all other Comets iu 
the midft of their Courfe. He finds the faid Circle inchned to 
the EcUptique about 26. 3©'. and the Nodes ^y^htxQ it cuts ic,to- 
wardsthe beginning o( Gemini and Sagittary : that it decline's 
from Equator about 26,d^md cuts ititowards the 11. d, 
and confequently, that its greateft Latitude hath been towards 
'Pifces, where it muft have been hiarch 24. and its greateft De^ 
climtion, towards the 25. d^ of the Equator^ where it was to have 
He puts it in its Perigee 'March 2j. about three of the Clock 
in the Afternoon, when it was about the 1 f . degrees of Pifces^ 
a little more Wefierly then Marchab, or the Wing of Pegajus^ and 
that it was to be in ConjunBiQti 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 Eafi^mA retards towards the Wejli 
which not being very fenfible in the firfl days , differs more a- 
bout the end, and in the beginning • which he leaves to Obfer- 
vation. 
He calculateth, that the greatefl Motion it could make in one 
day,hath been 4. d. and 8'. or 9', in onehour,about io'*and2 5". 
fo that its Diurnal Motion is to its left diflancc from the Earth a 
little more than as i. to 14. and its Hourly Motion, as i . to 33O. 
He wonders, that it hath not bqen feen fooncr ; the firft Ob- 
fervations that he hath feen ^ but made by others, being of 
March 17. Whereas he finds, that it might have been feen fince 
January, atleafl in the Months February and March^ when it 
rofe 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 th^-ee 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 
