{ 174 ] B04 
ENCAMPMENT AT ROCK SPRING 
’ Determination of longitude, April 16, 1844—altitudes Ce the sun. 
OBSERVATIONS. 
nBiiicsiiien 
FIRST SERIES. SECOND SERIES. 
Double atisades of the | Time of chronometer. || Double altitudes . de" : of chronometer. 
“~sun’s lower sun’s lower lim 
Deg. min. sec. h. min. see Deg. min. © sec h. min 
69 59. 40 3. 27. 70 10. #5 3 57.2 
69 23 = 40 35 1.0 70 20 35 37 33.2 
* 69 36:200 & 35 33.2 70 31 15 37 50.5 
a 69 47 50 36 6 B G45 10 38 24.6 
x 69 45 i a: ape 05 38 OTE 
Index error — — 2 sec. 4 
RESULT OF CALCULATION. 
Mean time. Retard. Longitude. 
as min. pe h. min. sec. 
Fo" ae BGS 
Delerminaies of pete April 16, 1844—meridian aPahates td the 4 sun. 
OBSERVATIONS. 
e 
Double altitudes of the sun’s lower limb. | Time of chronometer. 
Deg. min. sec. h. min. sec 
130 00 ‘ II 06 03 
130 47 50 07 34 
50 30. é 10 
130. 50. 45 Yio 
130 50. 45 13 
130 50 30 it 8 
Pome se i 50 00 15 al 
1 49 20 16 06 
<5 190° 40 5 16 50 
130° 47 40 17 36 
130 45 30 18 53 
ie 1 45 20 06 
mere ese Bs . Index error = — 2 sec. 
* he as ies Shee - * ry 
: RESULT OF CALCULATION. 
True central altitude. || Apparent time of transit. Latitude. 
ees ate : Se 4 i 
am min. see. 
41 56 
