238 



OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. 119. 



FEBRUARY 18th, 1854 : EYESINO. 



Lat. 35 19' N. : LCD. 139 43' E. 

 Sun set 5/i. 41m. 



C 7h. Om. 



Stronger Light 7/j.. &c., to 9 o'clock : Diffuse < 8 



I 9 



This was a beautiful evening ; sky perfectly clear. Watched to see the Zodiacal Light make its first appearance. 

 Sun set at 5" 40 m ; sky had nothing unusual till, at 6" 50, I became, all at once, conscioiis that I was looking at the 

 Zodiacal Light ; but it was dim. Its boundaries then seemed to be as in m on the chart (probably an error 

 occasioned by the usual horizontal whiteness) ; but the light was so dim that I could not fully rely on them. At 

 6" 56"' it was quite decided. At 7" the Stronger Light was at d. My attention was then called off for a few minutes, 

 but. at 7" 6 m , it was at d, and so to 7" 10'" ; all this while very bright. At 7" II" 1 it was dim ; but at 7" 12 m it had 

 brightened again and dimmed, and it was now at a. 



h. m. 

 At 7 13i 



7 14, 



7 15, 



7 



19, 

 20, 

 22, 

 23, 

 25, 

 26, 



7 

 7 

 7 

 7 

 7 

 7 



7 28, 

 7 29, 

 7 30, 

 7 31, 



7 o2u 

 7 34, 

 7 38, 



, still at a. 



at c, and bright. 



at b, and dim. 



still as at last. 



at a, and as if dying away. 



still as at last. 



at c. 



still as at last. 



at d, and very bright. 



, still as at last. 



at b, and dim. 



still at b, and as if dying away. 



same. 



at d, and very bright. 



, still the same. 



at e. 



still at e, but not so bright as when at d. It 



seems to be pulsating still, but I canuot tell 



with certainty. 



h. m. 

 At 7 40, 



7 42, 



7 43, ate, brightened. 



7 44, at e. It is dim for this altitude. 



7 45, 



the brightness pulsates, but I cannot perceive 



any pulsations in the boundaries. 

 at e. The light is dim for this altitude. 



do. do. do. 



7 48, still the same. 

 7 49, at e. Some little brightening up. 



7 51, at e, has brightened so as to be as when for- 



merly at d; so it remained. 



8 0, it was at f, and there were no more apparent 



pulsations. 



9 0, light steady. It has gradually dimmed since 



8' 1 , but is still tolerably bright. 

 10 23, boundaries as at 9 h , and light faint. 



