48 J. C. Watson—Discovery of a new Planet. 
distance between lines tangent to the cusps and to the oppo- 
site limb. 
Mean dates. Dist. of centers Extent of Hor. refr. of | Num. of 
Dec. of © and ¢. Crescent. ¢® atmos. job. of cusps. 
8 g* 0" Pp. Oo. 6 | Ses 360° 00’ 
TO> Ti -S6. AL 2 ht et 279. 28 46'°6 4 
10716 soe 4 es) 233 15 43 °0 6 
11 2 40 P.M 4 20°4 231 46 45°5 15 
12 2 45 PM 5 58°38 215. 21 42°9 a2 
Mean 44°5 
These observations give a mean of 445 as the horizontal re- 
fraction of Venus’s atmosphere, or about one-quarter greater 
r 
: : _ ¢—18 
sin y= sind sin < 3 a: 22=y — 
Yr. 
p 
in which d = distance of centers of O and 9. 
¢ = arc of crescent. 
r = sun’s semi-diameter. 
p = radius vector of Venus. 
« = horizontal refraction of Venus’s atmosphere. 
Six measurements of the diameter of the planet on the 10th 
give 63’"1. Twenty-four, on the 11th, give 63’-75. The Hng- 
lish and American Almanacs give 62’4 and 64’5 respectively. _ 
Art. VII.—Discovery of a New Planet; by Professor JAMES 
C. Warson. From a letter to one of the editors, dated 
Peking, China, October 17, 1874. 
have the pleasure to send you the following places of a new 
planet which I discovered at 8! 30™ on the evening of Oct. 10th. 
Peking M. T. a 
1674, Oct. 10," 18" 30™ 0° O08 58™ 1°68" -+-10° 42’ 52°0 
cote 9 58” 15 0 57 15°48 10 40 33°9 
WR ps 48 46 0 37: 1° 10 40° 227 
Ordky - ai oF 0 0-67: 116 10 40 24°8 
eis, 8 33 39 0 55 29°90 10 34 56°9 
7 oes 9 43 44 0 56 27°67 10 34 38° 
m 18, 9 56 45 0 55 27°22 10 33 478 
* Bey o 26 Hi 0 54 33°71 10° 31 67S 
eet 7 49 29 0 53 43°70 10 29 10° 
Oy, By 8 52 46°46 10 26 15°0 
58 3 0 
The planet resembles a star of bright 11th magnitude. 
