fiiggeft what I have taken notice of in my reflexions upon 
former Comets, which is y that more of them enter into our 
Syfleme by the (ign of Litra and about Spica virginis ^ then 
by all the other parts of the Heavens. For ^ both the pre- 
ftnt Comet 5 and many others regiftred in Hiftory 3 have 
entred that way^ and confequently pafled out of it by the fign 
Aries '-y by which alfo many have entred. 
I did found my Hypethejis upon three Obfervations only^ 
viz, thofe of the 225 26^ and 31. of December, Nor have 
rdone^ as fome have fancied of me^ who having been able 
to obferve the Cornet^ the 2/5 285 29^ 3O5 and 31. of Decem- 
ber 3 and to fee the diminution of its motion 5 have judged^ 
that I had only determin^ed that diminution for the time to 
come^conform to the augmentation thereof in time paffed 
until the "i^, December, For January i. (on v/hich day! 
compofed mj Ephemerides ).lkntw not (nor any perfbnhere) 
that the motion of the C<^met did diminifh^ but on the con- 
trary, moft men believed 5 it was not the fome Comet. But 
SigmoxCajfmi knows very well ^ that that was not neceflary^ 
feeing that two portions of 2l Tangent h^mg given g and the 
Angles anfwering Vhereunto^/tis eafic to find the pofition and 
magnitude of its circle. The reafon^which I think the true 
one 3 of the diminution of its Motion in Longitude 5 and of 
its Retrogradation, by me conje(3:urcd in my Ephemeridesy I 
begantobeafliiredofjFe^nic, For until the fixth ^ theCo» 
met had alwaies advanced 5 as Signior Cajjini slKo hath very 
well noted / but after that day 3 I found that it returned in 
augmenting alwaies its Latitude, And I have conftantly 
obferved itj until March 8. between many Stars^ which muft 
be the fame with thefe mentioned by Cajpni ^ whereof the 
number was fo great , that I thinkj I faw of thsm March 6. 
with one Aperture of my Glafs^ more then 40. or 50. and e- 
Ipecially^ above the head Aries 5 but I did not particular- 
ly note the fituation of more than 12. or 15 5 amongft 
which I have obferved the pofition of the Comet fince Ja- 
nuary 28. every day 5 when the weather did permit 3 viz. 
January 29. February 33 6, 10^ 17319524^6327. and March < 
C 2 
7 A 
