164 Mr. Schroeter's new Observations 
1. sin. d. o ex ? - 3,124488 = 1332", o = 22' 12'' 
1. sin. 17 0 42' 17" 9,483033 
3,641455 = 4379", 8 = i° 12' 59", 8. 
This is the quantity which, in the paper of my opponent, 
was erroneously stated at more than 2°i, because the diameter 
was taken instead of the semidiameter ; it was afterwards cor- 
rected to i e 1 1' 47^,6 ; but it is highly probable, that the points 
of the horns project still further, on account of refraction. How- 
ever, as we do not know the quantity of the horizontal refrac- 
tion on Venus, this cannot be ascertained with any certainty. 
It is sufficient for me, that I measured the crepuscular arch 
from the point where the extremity of the horn seemed to end 
in my instrument, and to my eye. 
(/ 3 ) Calculation of my late observation of the 21 st May, 1793. 
The time falls on 8 h o', mean Paris time ; and therefore we 
have, 
long, of the earth = 8 s i° 5' 55" 
heliocentr. long. of?==7 27 i3 27 
difference = 3 52 8 
lat. of Venus = 11 37,6 
log. cos. 3 0 52' 8" 
log. cos. 1 1 37 
9 > 999 00 9 1 
9 > 99993°2 
log. cos. of the angle - 9 > 99 8 9393 
angle at the sun =4° o' 10' 
sum of the other angles = 1 75 59 50 
half sum 
87 59 55 
