IN THE ARCTIC SEAS. 



27 



The radial correction, obtained graphically, see diagram, is, therefore, 



— 20". Reduction to centre 



869.1 k' .... 



+ 491.3 k'Jrh' . 



4-1242.2 k'—h' .... 



+ 16° 57' 28.0 d' .... 



+ 364.18 a'+p=a 



Reduction to centre 



k'= . 



k'+h'= 



k'—b'= 



d' 



a'-{-2}=a 



111M8 

 + 12™ 23.3 

 11'' 21 56.1 



11 40 20.0 



I m — n .... 

 Reduction to time of true 6 

 t .... 



+ 21".0 

 910.2 

 + 1054.3 

 + 166.1 

 + 11° 01' 46.0 

 —1265.89 

 111^83 

 —42™ 58.4 

 IS'' 24 33.2 



11 41 34.8 



y=no° 53' 02" 



Reduction to time of true 6 

 t .... 



* .... 



V=334° 38' 20" 



Time of true 6 in Van Rensselaer time ll"^ 40"' 20^0— 1.01 dB 



11 41 34.8 — 0.34d5 Hence c?i? = — 1 1 2. 

 Lona;itude of Van Rensselaer from immersion and emersion ^^ 43°> 06^; but since the immersion is 

 marlvcd doubtful, I give the weight one-half to the above result, and combine it with the uncorrected 

 result from the emersion, viz: 4''^ 43™ 44M. The resulting longitude becomes 4'' 43™ 31^ 



Longitude feom the Observations of the Occultation of S.\turn's Ring and Centre. 



Appro.ximate 



February 4-5, 1854. 



Immersion, last contact of ring 20" 44™ 20\8 \ Sidereal time or 5'> 4'' 25™ 55^2 



Emersion, centre . . .21 42 21.8 V at Van Rens- 5 23 52.8 



last contact of ring 21 42 49.1 ) selacr 5 24 14.0 



Greenwich 

 mean time. 



