370 Mr. South’s re-examination of the apparent distances 
No. XXVI. R. A. i7 h 56 ra ; Decl. 2° 33' N. 
70 p Ophiuchi ; II. 4 ; H. and S. 258. 
continued. 
“ May 11, 1780. 5". 468 ; but very difficult to take, and 
“ therefore not much to be depended on.”. . . . “ I am 
“ apt to believe that this method generally gives the 
“ distance too large.” 
“ June 19, 1780. if diameter, or between if and if by 
“ very exact estimation By measures 4".375.” 
“ August 28, 1780. 4 // -53i- Almost 2 diameters of the 
“ largest, which is the preceding star. The difference 
“ in size almost 2 to 1, or i| to 1.” 
“ May 27, 1781. Much above 2 diameters of the largest 
“ with 460.” 
“ April 28, 1783. Above 2 diameters.” 
From all these observations, it is clear that the interval 
between the stars about the year 1780 could not be less 
than 2 diameters, and by a mean of all the estimations, must 
have been about this quantity, or rather more than less. The 
small star being taken at 0.6 of the diameter of the large, 
the distance of their centres must have been 2.8 D, and the 
distance, including the diameters , 3.6 D. Now as this distance 
by the mean of all the measures, was 4".492, we have D = 
T.25 and 2.8 D = 3".5oo. 
Again ; we find the following observation, the only one 
which occurs in the interval in question. 
“ June 3, 1804. About if diameter of L.” 
This would give for the distance between the centers 
2.05 D = 2". 5625. 
So far then as estimations by diameters can go, these 
