Mr. Pigott’s Investigation of the Changes 
140 
Table VIII. 
Days. 
Days. 
Days, 
on a mean. 
Rotation on its axis - 
Duration of brightness, at its maximum, 
6 ii 
62-| 
62 — 
without any perceptible change 
Ditto, when it does not attain its usual 
8 + 
9i 
brightness - 
Duration of brightness at its minimum, 
20 — 
— 
~ 
without any perceptible change 
Ditto, when it does not decrease so much 
9 — 
9 
9 
as usual - 
Decrease in time, from the middle of its 
full brightness to the middle of its 
20 — 
least _____ 
Increase in time, from the middle of 
its least brightness to the middle of its 
34 
28 
33+ 
full - 
Extremes of its different degrees of] 
27+ 
5 + 
35 
J 7.8 
2 9 — 
brightness ; with a mean of its usual > 
variations J 
9 or 
0 
5* 
6 
