130 OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. 05. 



OCTOBER 3d, 1S53 : EVENINO. 



Lat. 22 23' N.: Lon. 113= 32' E. 



Sun set 5A. 421m. 



Stronger Light at Gk. 4om. Diffuse at 7/i. 5m. 

 C 57 7 30 



75 SO 



8 30 



9 



Had a, fine sky for Zodiacal Light, and watched it attentively. Twilight left behind it a dull, rosy light, which 

 gradually grew dimmer, and then died away. At G h 42"', there was almost a sudden flush of soft white, which was 

 the Zodiacal Light ; at 6 1 ' 45', it was as in the chart, the whole of it being the Stronger Light, with a little of the 

 Diffuse Light travelling ahead at its front or upper end, the latter at 6" 50'" being at 38 Librte. The Light was strongest 

 between 99 and 109 Virginis. Now commenced a singular sight. This sudden flush at 6" 54 m , or thereabout (for I 

 could not. tell exactly), began rapidly to grow dim, and to contract its limits; and at 6" 57" 1 , it had receded to the 

 boundaries given for that time in the chart, and had only half of its former intensity. Then, in a few minutes, it 

 began to widen again (though with only the lesser intensity of G' 1 57'"), and also to have a Diffuse Light along its 

 borders. At 7' 1 5'" the Stronger Light had reached its former bounds as at G h 45'"; the Diffuse being as given in the 

 chart. 



I noticed the same thing also on Saturday evening, but did not record it. It was so singular, that I thought it 

 might be an ocular deception ; bat it showed itself decidedly on Sunday evening, just as described to-night. 



At 9 h , the Light, was very faint. I knew it had extended itself as in the chart, because, in the early part of the 

 evening, the space about 27, 4-1, and 30 Ophiuchi was quite dark, and now it was brightened up continuously with the 

 space to 1 and 2 Ophiuchi. 



