ASTRONOMICAL OBSERVATIONS 



May 10, 1854. Observations of circum-meritliau altitudes of the sun, for latitude. 

 Gambey sextant ; on the floe near the brig. 



Pocket chronometer. 



O i^ 29™ 15"* 

 32 56 

 34 05 



Q 4 35 36 

 36 35 



37 41 



o 



Double altitude. 



61° 37' 30'' 

 37 10 

 37 05 



60 33 40 

 33 45 

 33 20 



Index error + 0' 16". t= + 12?.bF. 6 = 30.07 in. r = + 39°. 



O's corrected alt. (for index, refraction, and parallax) 30° 30' 56" 

 Chronometer time of observation . . . . 4^ 34" 2P 

 Chronometer error 4 39 25* 



30° 30' 58' 

 4h 4im28ii 

 4 39 25 



Mean time of observation 

 Hour angle 

 Reduction to meridian 

 Q's declination 



Resulting latitude 78 37 12 



Mean 78 37 06 



23 54 56 02 03 



— 1 10 + 5 58 



+ 0".5 and + 15".l 



+ 19° 08' 08" +19° 08' 12" 



78 36 59 



May 16, 1854. Observations of equal altitudes of the sun, for time. 

 Gambey sextant ; on the floe near the brig. 



Pocket chronometer. 

 A. M. 



Qh 46m Igs 



47 24 



48 17.5 



49 33 



50 35.5 



51 31 



Double altitude. 



O 49° 30' 

 35 

 40 



Q 50 50 



55 

 51 00 



Pocket chronometer. 

 P.M. 



gh 25-" 21«.5 



24 21 

 23 29 



21 



20 



0.5 

 11 

 10.5 



Pocket chronometer. 

 A. M. 



0" 53" 16».5 



54 15 



55 16.5 



56 22.5 



57 3.3.5 



58 32.5 



Double altitude. 



O 50° 05' 



~ 10 



15 



Q 51 25 

 30 



Pocket chronometer. 

 P. M. 



35 



8'' 18"» 31^5 

 17 36 

 16 33.5 



8 15 20.5 

 14 19.5 

 13 8.5 



A. M. Index error + 0' 20". <= + ll°.2F. 6 = 30.00 in. * = + 46°. 

 P. M. Index error + 0' 24". <= + 15°.0F. 6 = 30.07 in. * = + 53°. 



The reductions of observations of equal altitudes are made according to the 

 method given in the American Ephemeris and Nautical Almanac, for 1856. 



On reducing the observations, it was found that the chronometer error came out 

 too small by 2-i'.5 ; and, after working each set separately, the discrepancy was 

 traced to the morning observations. The following reductions, therefore, are based 

 on the two sets taken in the afternoon. It is probable that there was either an 



* For chronometer error see following observation. 



