200 OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. 100. 



JANUARY 5th, 1854 : MORNIKO. 



Lat. 22 IS' N. : Lon. 1140 10' E. 



Sun rose at 6I>. 44m. 



Western Zodiacal Light at 11A. Om. Eastern, Stronger Light l/i. 0m. Diffuse 11A. Om. Paled sky at 1A. 25m. 

 Midnight. 1 30 Midnight. 5 



10 30 10 



4 45 1 30 



3 

 5 



The moon did not set till about 11 o'clock. At that hour got an observation in the west, and found the Zodiacal 

 Light also quite decidpcl in the eastern sky. At ll h lo m the western Zodiacal Light between and 78 Arietis was 

 equal to that of the Milky Way at 51 and 54 (right foot) Andromedre, but it was of a warm cast. The eastern 

 Zodiacal Light was of about the same strength. At 12 h the boundaries were as before, but the Light was dim. At 

 l h 5 m it was still distinguishable; at l h 20 m all was gone. 



[P. S., 1856. The want of room in the chart here given prevents my giving the boundaries of this western Light 

 noted above. It extended as high as Aldebaran, and'at the western horizon, at midnight, reached 16 S., and 23 

 N. from the ecliptic. The vertices of the eastern and western Zodiacal Lights at 11 and 12 o'clock were 51 apart.] 



The eastern Zodiacal Light was quite decided at 11 o'clock last evening; its strength is referred to above. At 

 12 h (midnight), it was still the same; took boundaries also at 1" and l h 30". At 1" 25'" and l h 30'" the sky was paled 

 to the dotted line. Got the Stronger Light at I 1 ' and l h 30" 1 . I meant to get boundaries at 4 h , but slept so soundly 

 that the orderly's call did not rouse me till towards 5". At 5 h there was a paled sky beyond the Diffuse bounds, of 

 which I have given limits in dotted lines. Above the limits of the Diffuse Light, as given at 5 h , there seemed to be a 

 strip of paled sky; could not see how far up it went. At 5 h thin clouds came floating over, and stopped reliable obser- 

 vations. I could see between the clouds that the Stronger Light sunk, and seemed to pulsate, as yesterday morning. 

 At 5 h 15 m , as the clouds were obstinate, and would not admit of any definite results, I left the deck. 



