204 OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. 102. 



JANUARY 10th, 1854 : MORNING. 



Lat. 22'^ 18' N. : Lon. 114 10' E. 



Sun rose 6A. 46m. 



Stronger Light at 3h. Om. Diffuse 3A. Om. 

 40 40 



60 SO 



6 5 

 6 7 

 5 12 

 5 10 



Clouds since last date (6th). Moon set just before 3 o'clock. At 3", &c., had observations, for which see chart. I 

 watched very carefully at 3", 4 h , and from 5 h on, to see if there were any pulsations. Nothing till after 5 h . At 5" 

 the Stronger Light was very bright, and extending up to Spica, though dimmer at its upper end ; at 5 h 5 m it had sunk 

 to a Libra?, and had become greatly dimmed ; had about half its former brightness. At 5' 1 7 m it seemed to have 

 ascended about 9, and to have brightened some ; at 5" 12 m it was down to 38 Libra?, and had dimmed; it perhaps 

 rose a little again, but of this I was not certain. At 5' 1 19'" it was down to ft and 6 Scorpionis, and had spread to 

 the northward ; it was now bright; at 5" 23 the light broke bounds, and dawn had come. 



These risings and sinkings, and changes of intensity, are as they appear to me to be; but the upper limit of this 

 Stronger Light is so indefinite, and the changes are of such an indefinite character, that I wish to speak of them 

 somewhat doubtingly. Of the first sudden sinking and loss of intensity, I think, however, there may be no doubt. 



The morning was remarkably favorable for observations; atmosphere clear, sky very bright, and very little haze 

 on the horizon. 



In September 2d, and October 4th, of last year, are notices of an increase of the Zodiacal Light after the first 

 dimming. I remember noticing, not imfrequently last year, an .apparent ascent of the Stronger Light after its sud- 

 den subsidence, and also, with this, an increase of light; but there seemed to be more uncertainty attending its 

 character, and I believe I have neglected to take note of it. 



