“ 503 . [ 174] 
ENCAMPMENT AT ROCK SPRING. 
" Determiiation of latitude, April 15,1844—altitudes of Polaris, 
OBSERVATIONS. 
Do tudes of Polaris ; Time of chronometer 
Deg. min. sec h. min. see. 
67 30 25 7 12 54 
67 30 14 26 
67 28 25 16 21 
67 27 30 18 07 
67 26 00 q 2 51 ° 
a 
Index error = + 20 sec. 
x 
RESULT OF CALCULATION. 
True altitude. Mean time. 
Determination of longitude, April 15, 1844—allitudes of Arcturus. 
OBSERVATIONS. 
no Si, 
Double altitudes of Arcturus. Time of chronometer. i 
i ~ * : PP he 
-— min. see. h. min. sec. 
~ , 7° 25° «(66.5 
oe ww 8 ‘ 2? oe 
65 0 29 0 
65 3126.5 
66 14 20 32 28.0 
#2 $$ $$ 
Index error = +- 20 see. 
RESULT OF CALCULATION. . 
rd 
¢ : %y : a 
Mean time Rated. » Longitude, 
r 5 
h. min. sec hice MNE = BCC. P Deg. min. . -ser. 
Cm, 07 ' BB 2e 118 20 = 00 7 
* 
we at 
& 
