TOTAL SOLAR ECLIPSE OE JULY 18, 1860. 
39T 
Spot. 
Position-angle. 
Distance from the centre in 
a decimal of the radius. 
^ . 
113 33 
•9979 
114 
40 
•9953 
116 
31 
•9643 
t ... . 
117 
37 
•9984 
In consequence of the partial breaking up of the spots on the 19th and 20th, it was 
not easy to identify them, and the Greek letters may possibly not refer in all cases to 
the same spot. The following, selected from many other small spots surrounded by 
faculse, were measured on a photograph taken on the 19th at O'* 9“ 51® Greenwich mean 
time : — 
Spot. 
Position-angle. 
Distance from the centre 
in a decimal of the radius. 
^ . . . . 
117 26 
•9518 
0 ... . 
119 
45 
•8872 
; . . . . 
120 
19 
•9607 
K ... . 
124 
48 
•9166 
On the 20th, civil reckonmg, or astronomical reckoning 19th day 23’’ 46“ 45% the 
photograph K was taken, when a fresh spgt cl had made its appearance on the eastern 
limb ; the following are the results of the measurements of this spot, and of some others 
in the group surrounded by faculce. All these spots had altered greatly since the 
pre-vious day. 
Spot. 
d 
I 
I 
6 
K 
Position-angle. 
86 
26 
•9961 
121 
3 
•8713 
123 
53 
•8896 
126 
10 
•7733 
130 
52 
•8231 
Distance from the centre 
in a decimal of the radius. 
Table V. 
Table V. contains the results of the measurements of the principal spots («, h, c), the 
angles of position being coiTected for the errors of the wires, and the distances given in 
a decimal of the radius of the sun. In the case of each spot, the particular edge measured 
is indicated on Plate XV. by a dotted line, and by means of Table V. my results may be 
reduced to those of other observers who may have measured a ditferent part of the same 
spot. 
Column 1 gives the number of the photograph ; column 2 the date of the photograph ; 
columns 3, 8, and 13 the distances of the spots a, h, c from the sun’s centre in a decimal 
of the radius; columns 4, 9, 14 the averages of several measiwes; columns 5, 10, and 15 
tlie position-angles ; columns 6, 11, 16 the average position-angle for several photographs ; 
and lastly, columns 7, 12, and 17 the mean epochs of the means of the measures. 
MDCCCLXII. 3 II 
