Miscellaneous. 333 
By A. Hall :—. 
T = June 11.280. Washington 1 m: t; 
248° 51’ 50” 
T = 
Ce Ayes 278 59 23 
a =a 85 41 27 
log. g = 9°91352 
Motion direct. 
From the above, Mr Safford fads the following approximate ephemeris 
for 10" 24" m. t. Washington, A and r representing the distances from 
the earth and sun seupectively. 
(1861. r) log. A log. r. 
2) Ct 178° 42’ +66° 8/ 9°3404 99716 
we Oy 188 21 64 45 ne ee 
LY pate 195 24 63 13 9°4281 9-9800 
te) a O00 oT 61 42 aee Ace 
ry ae, me. 0 | 34 60 18 95051 9:9887 
ae A 207 39 - 69 2 ees Bi 
Bit. 210 .5 - 57 54 9:°5722 9°9976 
2 oe. 212 5 56 52 
» 13, 213 44 +55 57 9-6318 0/0066 
The following, computed by Mr Hall for Washington mean midnight, 
will give an idea of the path of the comet previous to its becoming visible 
in the northern hemisphere :— 
W'm. t. a p) log. A. 
Mane 12'6, wwe » GLP B9"1 — 26° 32/3 9°7.222 
» 165, 63 16°3 23 18-4 9°6182 
3, 20°98, 66 4:9 7 (EG 9°4831 
5» 24:5, 71 56°9. — 3 45°4 9°3105 
» 28:5, 85 17-9 +27 41°5 9°1420 © 
July 2:5, 132 15°9 63 34:0 9:2027 
5.) 18S, 188 539 64 38-6 9°3884 
ork Ga, > 207 50°1 +58 56°5 9-5420 
- June 29:0, . 89 30°4 +33. 8:4 9-1330 
The comet ea its paige’ node June 28:086, Washington m. t., 
when the difference between the heliocentric longitude of the comet and 
of the earth was 2° 0’. ‘The difference between the geocentric longitude 
of the comet.and of the sun was 12° 29’. Log. of distance of the comet 
from the earth=9°1529. Calling its brilliancy - unity on J uly 2°5, we 
rae 
June 12:5, brilliancy = 0-11 
» 165, » 0-18 
jp, 2085, i 0°33 
»» . 24:5, ys 0-69 
” 28°5, ” 1°41 
July 2:5, iy 1:00 
ee Rs ” 0°50 
» 29:5, " 0:18 
computed by the equation, brilliancy = a 
It will be seen that the comet, at about the time of its perihelion, must 
have been well situated for observation at the Cape of Good Hope and 
other points in southern latitudes. The calculated brilliancy is indeed 
much less than on the 2d of July, being only about one-tenth; but it is 
well known that the formula cannot be relied upon for the variations of 
NEW SERIES.—VOL. XIV. NO. 11.—ocT. 1861. 2u 
