of the Sun ami Solar Syjle.n, 
It will be found, that I have placed the want of fenfiblc 
'motion of a Lyras and « Orionis in right afcenfion, and of 
Rigel both in right afcenfion and declination to the account of 
tliofe flats that are in favour. Thefe ftars are fo bright, that 
we may reafonably fuppole them to be among thofe that are 
neareft to us ; and it they had any confiderable motion, it would 
naoft likely have been difcovered, lince the variations of Sirius, 
Arfturus, Procyon, Caftor, Pollux, &c. have not efcaped our 
notice. Now, from the fame principle of the motion of the 
folar lyftem, by which we have accounted for the apparent 
motion of the latter flars, we may account for the apparent reft 
of the former. Thofe two bright ftars, a Lyras and a Orionis* 
are placed fo near the direction of the afligiied folar motion, that 
from the application of my fecond theorem (p. 261. of the 
paper On the Motion of the Solar Syftem) their motion ought 
to be infallible in right afcenfion, and not very confiderable in 
declination, all which we find is confirmed by obfervation. 
With refpedt to Rigel and a. Serpentarii, admitting them both 
ns flars large enough to have (hewn a proper motion, were their 
fituation otherwife than it is, we find that they alfo fliould be 
apparently at reft in right afcenfion ; and Rigel having fouthenl 
declination, and being a lels confiderable ftar than a Orionis, 
which thews but 11" motion towards the iouth in 50 years, 
its apparent motion in declination may, on that account, be 
alfo too fmall to become viiiblc. 
1 fhould not omit to take notice of a very remarkable paragraph 
of mayer’s, which feems to contain a ftrong objection againft 
the motion of the folar lyftem, while indeed it may be fhewn 
to be a very good argument in its favour. At the end ot his 
trad, DeMotu Fixarum, he fays : “ Tandem, quum et quaeri 
“ poflit, quae hujus motus caula fir, hoc unum monere vifum* 
P p 2 u ilium 
