comparative Brightness of the Stars. 
m 1 
Notes to Cetus. 
14 There is no observation of this star by Flamsteed. 
24 There is no observation of this star by Flamsteed. 
51 Is 10 6 Piscium. 
68 A periodical star of a great range in its lustre, as appears 
from the expressions I have given of its comparative bright- 
ness. Its period is 331 days, 10 hours, 19 minutes. See Phil. 
Trans. 1792, Part I. page 25. Different authors, however, 
vary a little in their determinations of the length of this pe- 
riod ; for which we may account by admitting the star to be 
subject to considerable alterations in the emission of light, from 
some parts of its surface, which being more copious sometimes 
in one place, and sometimes in another at some small distance, 
will give a different result to the observations of the time of its 
maximum ; while, notwithstanding, the general period of its 
changes will not be considerably affected by it. We have a 
similar instance in the rotation of Jupiter, which seems to vary 
on account of the little stability of its spots. See Phil. Trans, 
1781, Part I. page 123 to 12 6. 
90 Is 1 Eridani. 
Catalogue and Atlas. 
14 and 24 should be out. 
54 “ requires -f 1' 8" of time in RA. Sept. 4, 1786." 
Atlas. 
18 “Is not laid down very accurately in Atlas, Sept. 22, 
ms” 
3 Q 
MDCCXCVI. 
