342 OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. 171. 

 JUNE 29, 1854: EVKNING. 



Lat. at KlA., 38 ^ 33' N.: Lou. 136 21' E. 



Sun set G/i. 57m. 

 Stronger and Difluse Light at 10 o'clock. 



Last evening, cloudy. Moon did not set this evening till about U" 52'" ; then I got an observation (10 o'clock) as 

 in the chart. The sky was perfectly clear and brilliant down to the horizon. The Zodiacal Light was dim at this 

 hour, but quite distinct. The Stronger Light had well defined boundaries below a a ; above that, it dimmed off, till 

 at last it was difficult to ascertain its limits. In the morning observation, had been a new feature, namely : a 

 departure of the lower line of the Stronger Light from parallelism to the ecliptic ; and this evening I gave more 

 particular attention to what I had suspected several evenings past, namely : a tipping up of the apex of this Light, 

 so as to bring it to the right of the ecliptic line. J have put in the chart what seemed to be the termination ; but 

 the light there is so faint at 10'', that I cannot speak positively. I give it as, after long and careful and repeated 

 trials, it appeared to me to be. 



At 10" 20 m the Light was still distinct, as high as 29 Virginis, but dim ; its boundaries the same as at 10 o'clock. 



