208 
Dr. Herschei/s Observations 
Feb. 4, 1793. Correction of the clock, — 1' 28", o. 
2 h 55'. 7-feet reflector ; power 172. The air is very clear* 
and I see Venus very well defined ; but cannot perceive any 
inequality on the edge of the planet that might denote a 
mountain ; though the situation is favourable, being a little 
more enlightened than what we may call her last quarter. 
With 215 , 1 had a very distinct view for a long time; but can- 
not perceive any inequality on the line which divides light 
from darkness. 
With 287 , 1 perceive no mountains : with 430, very distinct, 
I perceive no mountains. The terminating line is not so 
sharply defined as the circumference; but no inequality is 
visible. 
With the same power, I see on Saturn, the equatorial belt, 
the shadow of the ring on Saturn, the shadow of Saturn on 
the ring, the division of the ring, &c. 
I do not find any spot on Venus ; so that there is no possi- 
bility to assign its diurnal motion. 
March 3, 1793. Correction of the clock, — 2' o", 6 . 
6 h 30'. 7-feet reflector ; I observed Venus with many 
powers, but could perceive no spot by which its diurnal mo- 
tion might be ascertained. 
April 3, 1793. Correction of the clock, — 2' 43", 9. 
q h 9'. 7-feet reflector; power 215. The evening remark- 
ably fine. There is no spot upon the disk of Venus, by which 
its rotation might be ascertained. The horns are equally 
sharp. There is nothing that has the appearance of a moun- 
tain, like what we see in the moon. With 287, very well de- 
fined, appearances are the same. With 430, not the least ap- 
pearance of any mountains. 
