262 



OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. 131. 



MARCH 27tli, IS54: EVENING. 



Liit. 3J 2(3' N. : Ltm. 139 42' E. 

 Sun set Git 12.W. 



Stronger Light j g'' 1 g,'' j Diffuse at 7/i. 30m., &c. 



Sky remarkably clear. The following are my notes : V 15', a whiteness running up with the Zodiacal Light 

 boundaries as far as the Pleiades, but its limits are not distinct : 7" 24'", the light more decided, but its boundaries 

 not reliable: 7" 30'", got boundaries of both Diffuse and Stronger Light the latter, then, strong up to b, and, 

 gradually tapering, dimming off to c. 



h. m. 



At 7 35, at a, and dim. 



7 38, do. do. 



7 39, at b, and bright. 



7 43, do. do. 



7 44, at , and certainly dimmed. 



7 45, at b, and bright. 



7 47, at a, and dim. 



7 484, do. do. 



7 49, brightening. 



7 50, at b, and bright. 



7 51, at b, and quite bright. 



7 52|-, dimming. 



7 524, at n, and dim. 



7 534, brightening. 



At 7 54^, at 5, and bright. 



7 .">.">?,, at b, and quite bright. 



7 57^, at a, and quite dim, as if dying away. 



7 58|- do. do. do. 



7 58|, brightening. 



7 59-J, at b, and bright. 



0, do. and quite bright. 



3, brighter than at any time yet, and has clearly 



ascended to the Milky Way by lines d d. 

 4-J, dimmed, and sunk to l>. 



7, brightening. 



8, very bright, and at d d. 



8 15, still as at last, and seems to be permanent now. 



9 30, boundaries to x. 



8 

 8 



8 

 8 

 8 



I think I can know when it is going to be permanent, by the upper portion of the Light brightening more than at 

 anytime previously in the evening, and the strong brightness ascending higher up. The first appearance of the 

 Zodiacal Light seems to be a white light i. c., when the twilight is not fully gone ; afterwards it changes to a warm 

 yellowish light. The reverse of this happens in the morning. The Diffuse Light is now very dim : in the morning 

 it is very strong, for it. 



This evening was remarkably fine for observations, and in my notes is the remark: " It certainly does pulsate." 



