604 OBSERVATIONS ON THE ZODIACAL l.IGUT. 



No. 332. 



MOON ZODIACAL LIGHT. 

 FEBRUARY 15th, 1851. 



Lat. 3.j 19' N. : Lon. 139 43' E. 



Sun set at 5fi. 364m. 

 Observations at7A. 35m. ,7A. 37m., 7A. 39i., 7A. 4'i'., ninl 7A. 43m. 



The eastern sky was excellent for observation, except a belt of whiteness generally along the horizon, and so wide 

 as to make it difficult to get the boundary at the southern side of this Zodiacal Light, except at its upper part. The 

 observation was very satisfactory. At 7 1 ' 30 m I thought I could see a very faint tinge in the usual Zodiacal Light 

 boundary, but was doubtful : 7 1 ' 33 m a tinge, not doubtful, but too indefinite to give boundaries : 7" 34"', decided : 7" 

 35 m , got boundaries (see chart): 7" 37"', bounds as before, but Light stronger : 7" 43'", very bright, especially about 

 its lower end : 7 h 45, as in chart, bright : 7" 47 m , general light beginning, and boundaries not so clear ; but at this 

 time, and till 7" 53 m , seem to be about as at 7" 45'" : 7 h 52 m , disc of moon begins to show itself, but in the haze : 7 h 

 53" 1 , general moonlight. 



The difference between the elevation of the Light, this evening and the 14th, was doubtless caused by the long 

 twilight here ; in consequence of which, darkness on the 14th had not fully set in at the time of that observation, and 

 thus the Zodiacal Light was not fully revealed that evening. 



