OtT. 2, 1885.] 



♦ KNOWLEDGE ♦ 



At 10 oVlwk... 

 At 9J o'clock... 

 At 9Jo'cl)ck... 



NIGHT SKY FOR OCTOBER (Fikst Map 



Showing the heavens as lliey appear at the following hoii 



tolcr 7. I A* 9^ o'clock October in. I 



tolerll. At 9 o'clock October 22. 



tolcr l."i. I At 8J o'clock October 2«. | 



.t 81 o'clock... 

 .t 8i o'clock... 

 .tS o'clock... 



tuUites of Uranus, Prof. Asapli Hall, of the Wasliingtou 

 Observatory, deduces the following results :— 



Mass of Uranus = 22Qg2H,r27 

 The mass of the sun being the unit. 

 Prof. Hall obt,'iin(Kl results so closely accordant as regards 

 the position of the planes of the orbits of Titania and 

 Obenin, that ho thinks we may fairly regard tliese planes 

 :i8 coincident. Ho obtains for this common plane the 

 following elements of position, N being the longitude of 



the ascending node, I the inclination, t the i 



The vain 

 putations 



3 li>83-0:- 



N=165"-812 + 0'^-0142< 

 1= 75-300-0-0014< 



s of the mean distances a, assui 



Oberon, o=41"-15 



Titania, a = 31 ■4t) 



Careful se.ircli was made with the 



new satellites during the favourable c 



1884, but none were found. 



great refractor 

 ppositions of 18) 



