13S 
Mr. Pigott’s Investigation of the Changes 
Table V. 
Decrease from the Middle of its full 
Brightness to the Middle of its 
least. 
See Table I. 
1796. September 17 \ , 
October 22 ^ ' 
1797. May 14: - -1 
July 10 - 
CM I ' 1 39 
September 15/°^ 
October 15 - 
November 6 J 
1798. July 29 - -i g 
September 15 T* 
October 25 1 6 
November 10 J 
1799 - August 7 - i 
September lb i ^ 
October 11 1 Q 
November 5 J 
1801. July 14 - I . 
August 21 - 1 ° 
September 24 -j 
October 16 J 22 
34f onamean ’ 
Increase from the Middle of its least 
Brightness to the Middle of its 
full. 
See Table I. 
30 
1796. September 3 -» d 
September 17 J ^ ^ 
October 22 1 
November 13 J 
1797. July 10 - g 
August 7 - J 
September 15-) 
October 15 J 
1798. July 10 - ■> 
July 29 - - J J 
September 151 
October 25 J ^ 
17 99- J u] y 4 - - 1 q , 
August 7 - 
September 16 a 
October 11 J ^ 
1801. August 21 - i 
September 24 j 
2 7"f" on a 
mean. 
The sum of these two means (61-j- ), agreeing so satisfac- 
torily with the whole rotation (bi|-), no correction is requisite, 
as was the case with the former determinations of 17 96 to 
reduce them to 28 and 35 days, results that differ considerably 
from the above ( 34 and 27 -}- ) ; but as they were deduced 
from only two int r ais, the disagreement cannot be of any 
consequence, provided the number of each set be proportionally 
