■comes to that m the beginning ©f Mmh m%t ] !e will equal 
‘Or even exceed the Stars of the Third Magnitude s noting, that from 
the Obfer vat ions hitherto made of this Star , it is manifeft 3 that 
the greateft Pbafes thereof do every year anticipate by 32. or 3? a 
■cl ayes $ forafrrmch as An, 1660, its, great eft Appearance was about 
•■the end ol October and the beginning of November y An . 1661 a 
.about the end of September 3 or the beginning of October* An, 1 66z, 
about the end of Anguft^ &e, fo that this year it muff be in March] 
if the former Analogy do hold , 
He collets alfo from the Obfervations , That one Period from 
the greateft F hafts to the next 5 confiks of about 333, dayes but 
that the interval of the time betwixt the times of its beginning to 
.appear equal to the Stars of the Sixt Magnitude 5 and of its ending 
to do fo 3 confifts of about 120, dayes: And that its great eft Ap- 
pearance Ms about 15, daye.9 : All which yet he would have un- 
derftood with fome latitude. 
This done 9 he proceeds to the inveftigatlon of the Caufes of the 
Viciflitudes in the Emerfion,and Disappearance of this Star 3 and 
having difcourfed 5 That the apparent Increafe and Decrement of 
every Lucid Body proceeds either from its changed diftance from 
the Lye of the Obferver j or from its various fite and pofition in 
tefped of him , whereby the angle of Villon is changed 5 or from 
the increafe or diminution of the bulk of the lucid body it felf : and 
having alfo demonkrated it irapofiible , that this Star fbould move 
m a Circle 5 or in an Ellipftsy and proved it improbable that it 
fhould move in a Strait Line % he concludes^ that there can be no 
other genuin, or at lead , no. other more probable caufe of its 
Emerfion and Occultation 3 than this, T hat the bigger part of that 
round Body is obfcure and jnconfpicuous tons, and its leller part 
lucid 3 the whole Body turning about its own Center, and one Axe*, 
whereby for one determinate fpace of time it exhibits its lucid 
part to the Barth 3 for another, fubduds it: knot being likely, 
that fires (hould be kindled in the Body of that Scar , and that the 
matter thereof Ihould at certain times take fire and fhine 3 at other 
times he extmguifht upon the confumptionof that- matter. 
So far of that Star . As to the other in the Girdle of Andromeda 5 
fen about the beginning of An , 166 5 $ he relates > that, when in 
. the end of 166^ the World beheld the then appearing Comet , 
' ’ f ■' k ■ ' - ’ ~ Aftro- 
