248 



OBSERVATIONS ON TUB ZODIACAL LIGHT. 



No. 124. 



FEBRUARY 25th, 1854: EVENING. 



Lat, 35 25' N.: Lon. I39 U 41' E. 

 Sun set 5/i. 47,1 m 



Stronger Light 7/(. 14m., &c., to 10/i. 3Um.: Diffuse -j g " ( 



Sun's longitude 336 36'. 



f 7/t ]5m. 



8 (1 



9 (I 

 10 



Clouds this morning. 



At 7 35, dimming. 

 7 35-J-, at c. 

 7 36, at b, and dim. 



The evening sky was perfectly clear and very favorable, anil I had good observations. At 

 7 o'clock the Zodiacal Light was visible, but uot distinct enough for g.>od outlines ; 7' 1 14 m , took outlines as at d. 

 (There seemed to be some slight pulsations from this to 7 1 ' 19'", but could not make them out reliably.) 



h. m. li. m. 



At 7 19, dimming. 

 7 20, at c. 

 7 22, at d. 

 7 23, do. 

 7 24, at c. 

 7 25, at a. 



7 2(:i, ascending and brightening. 

 7 2Gi, at c. 

 7 27, at d. 



7 2R|, at a, dying away. 

 7 30, at <?. 



7 30i, do. and brighter. 

 7 3H, same as last. 



7 32|-, do. and very bright. 

 7 33, and 7" 34 m , same as last. 



39, 



37, do. 



37A, brightening. 



38, at d. 



do. and brighter. 



do. and quite bright. 



do. and not so bright. 



do. and brightened again. 

 7 41|, do. quite bright. 



7 47, has continued so, and seems now to be perma- 

 nent. 

 7 50, pulsations are now clearly over. 



40, 

 41, 



When ascending, the Light always gained its highest altitude before getting its greatest brightness at that altitude. 



When this Stronger Light is going to be permanent, the lr!</fifcr portion of it (before, below the spot marked a) 

 now shoots up higher, as far as to b; 7 1 ' 54 m , has got up to c ; 'J 1 ' and 10", was as in the chart. At 9'' 30'", the Stronger 

 Light had dimmed some, but was still bright ; at 10'', boundaries as at 9" 30'" : Light dim, but easily made out ; 10" 

 30', same as last ; 10'' 30 m , it is sinking du\vn under the horizon not dying away. At this hour its upper limit was 

 near some haze on the horizon, and I gave up observing. 



