OBSERVATIONS ON THE ZODIACAL LIGHT, 



No. 3. 

 APRIL 5th, 1853 : EVENING. 



Lat. 18 51' X. : Lon. 111 16' E. 

 Sun set Gh. llm. 



Stronger Light -{ 7 30 ^Diffuse, probably at 6/1. 50m. 



The evening was favorable for observations. The Zodiacal Light began to show itself soon after 6 h 39 m . There 

 is now scarcely a doubt in my mind that the Stronger Light changes its place, bodily, during the evening. At first, at 

 6 h 50 m , it was bounded by the line a a a. When I went out again, to observe, at 7 h lo m , it had changed, and its 

 boundary was at b b b; at 7 h 30 m , it had brought its boundary to c c c; and at *i h 45 m , to d d d. At 8, it had got 

 still further to the left, and was as given in the chart at e e e, its right border being about Saturn ; but at this last 

 observation the light was very dim. At 8 o'clock, and for some time previously, the Diffuse Light, over towards 

 Algol, had faded entirely away. 



