IN THE ARCTIC SEAS. 



25 



Immersion. 



C's horizontal paral. at Van Rensselaer 53' 56". 7 

 Relative parallax h . . ■ . 53 55.T 

 —62° 19 21.1 



— 10 00.09 



— 48 51.19 

 890.9 



a — a^p^ 



Augmented semidiameter C 



Emersion. 



C 's horizontal paral. at Van Rensselaer 53' 56' 



Relative paralla.x tt 

 a — s 



a' — a=p = 



Augmented semidiameter C 



. 53 55.4 

 -70° 26 31.5 

 10 38.50 

 49 20.16 

 890.5 



The following quantities were computed for the purpose of plotting the pheno- 

 menon to obtain the points of contact on the ring, and the required radial correc- 

 tion to the moon's semidiameter to refer the point on the ring to the centre of 

 Saturn. 



Appro.ximate a £ at immersion 3'' 38™ 22". 58 

 a )2 " 3 39 09.11 



At emersion 3'' 39" 26'. 35 

 3 39 08.71 



At immersion. 



Relative approximate difference in AR (reduced to a great circle) — 11' 06".3 

 " " " in declination . . . . + 9 31.6 



Geocentric elements of Saturn's riuj 

 ^ = _2° 38' 

 a= 45". 6 



6= _18.6 



+ 4' 12".5 

 + 14 23.5 



) 



a'= 30".3 



b'= —12.3 V From the Greenwich N. A. 



Southern surface visible. ) 



By means of the above numbers, the moon's path relative to Saturn was plotted, 

 and the correction to refer the points of contact to the centre was obtained graphi- 

 cally. See above diagram, showing the position of the planet and ring, and con- 

 tacts of the moon's limb. 



