660 



OBSERVATIONS ON THK ZOIMACAL LIGHT, 



No. '283. 



JANUARY ISth, 1855: EVENING, 



Lat. at Sh., 5 7' S. : Ln. 82 14' VV. 



Sun set at 6/j. 18i. 

 Stronger Light at 7A. 2()m., &c., to !IA. : Diffuse 7/i. 4u/. au'l 8A, 



when the Zodiacal Light was bounded as in the chart at a. 



A remarkably fine, clear night, and everything very favorable for observations. Began, to record them at 7 1 ' IS 01 , 



My record is thus : 



h. m. 

 At 7 47^, exceedingly bright, and at c. 



7 50|, still so. The effulgence has ascended to z. 



7 52, do. do. 



7 54|, effulgence very great ; bounds at c. 



(The effulgencejnot greater than at first, when 

 it readied only to x ; but it is now more 

 striking, inasmuch as it ascends higher up 

 to z.) 



h. m. 

 "At 7 25, 



7 26, 



7 27, 

 7 27i 

 7 29, 

 7 31, 

 7 33, 

 7 33i 

 7 

 7 



*7 3fil 

 I OU| 



7 37, 

 7 38, 



36, 



7 40, 

 7 41, 

 7 42, 

 7 43, 



7 



7 47, 



boundaries at a, and bright within the zigzag. 

 the brightness has extended to the zigzag y ; 



boundaries at b. 

 at x, and dim. 

 , quite dim. 

 brightening. 



bright, and bounded by b b. 

 still so. 

 , very bright, 

 , dimming, 

 brightening. 

 , bright, and at b, 

 quite bright, 

 still so. 

 , dimming. 

 dim, and at a. 

 brightening, 

 bright, and at b. 

 very bright, do. 

 , remarkably bright, and bounds have extended 



to c. 

 still so. 



7 56J, has just brightened somewhat. 

 7 58, dimmed a little, but bounds at c. 



7 ">!), brightening. 



8 0, bright once more. (How fast and 



how strik- 



ingly the angle of inclination with the 



horizon changes !) 



8 4, is quite bright, and extends now beyond c c. 

 8 9, bounds at d d ; but it is not so bright as before, 



nor are the boundaries so well defined. 

 8 13, pulsations appear to have ceased : the Light 



much diminished in strength. 

 'J 0, the Light distinct, but very dim, and its bound- 



aries can scarcely be got reliably." 



