OBSERVATIONS OX THE ZODIACAL LIGHT. 



No. 91. 



DECEMBER 20th, 1853 : EVKMNG. 



Lat, 223 IS' N.: Lon. IIP 10' E. 



Sun set 5A. 23m. 



Stronger Light at 1h. Om. Diffuse Git. 4am. 



7 15 7 15 



7 30 7 30 



S 30 S 30 



9 30 



Atmosphere remarkably clear. Sky unclouded. Watched to see how the Zodiacal Light would first show 

 It came so gradually that nothing belonging to it could be made out, till at 6 h 30'", it was evident that the .sky along 

 its place had paled somewhat. The twilight is long, and at G 1 ' 35 darkness had not fairly set in. But the Zodiacal 

 Light was faintly marked in the sky, even before the stars were all fully out. The Light was not strong enough to- 

 give boundaries till 6 h 45 m , when I got those of the Diffuse Light; the Stronger did not show itself distinct from the- 

 other till 6" 55 m ; at 7' 1 , I got its boundaries. For the rest, see the chart. The Light was brightest at about 7" 3CP. 

 The Stronger had dimmed at 8 h SO 1 ", but was yet good. At 9 h 30'", there was no Stronger Light as such; but the 

 Diffuse was very bright, the Stronger seeming to have spread into this. Exhausted by last night's watching, I 

 now went to bed. 



