Mr. Bowditch on the solar eclipse, Sept. 17, 1811. 269 
correcting the moon’s tabular latitude, and the apparent times of the 
conjunction deduced differed nearly a quarter of a minute. By re- 
peating the calculation it was found that they would both give the 
same result 1h. 41 557, by decreasing the latitude 10’*4. The er- 
ror of Burg’s tables in the latitude of the moon is therefore by this ob- 
servation — 104. By subtracting the time of conjunction 1/4. 41’ 
55"°7 from 6h. 57' 061, the longitude of Monticello is obtained 5. 
15’ 10-4 = 78° 47’ 36” W from Greenwich. 
At Washington, Columbia, by Seth Pease, Esq. Sept. 17, 1811. 
These observations were made in the latitude 38° 54’ N, reduced 
38° 42’ 47”, and 1’ 27” in space, or 5’°8 in time, W from the a 
. App. times. ()-@©)Par.long. Par. lat. ‘ Aug.S 
Beginning Oh. 22’ 089 8’ 30"°7 30! 48"°5 4’ B69 
Annulus formed 2 02 06°0 —6 51°9 87553 ta fle 
Annulus broken 2 06 53°1 —7 31 °8 3814°3 1452°13 
End of the eclipse 3 86 52°8 -18 07 0 4326°3 1449 °38 
eT he apparent times of the conjunction deduced from the internal 
contacts, without correcting for the error of the moon’s latitude, were 
Vi. 49’ 55"-1 and 14, 48’ 198, differing 35’°3. This difference is 
wholly corrected by decreasing the moon’s tabular latitude 10"6, 
which makes the time of conjunction by both observations 1/, 48’ 
89-6. The external contacts give 14. 48’ 58-2. Mean 1A. 48’ 48"°9, 
which, subtracted from 6A. 57’ 6’*1, gives the longitude of the place of 
observation 5A. 8’ 17:2, from which subtracting 5”°8 there remains the 
longitude of the Capitol 5/. 8’ 114, by this observation. 
The eclipse of April 3, 1791, observed at Georgetown, by Mr.” 
Ellicott, makes the longitude of the Capitol 54. 8 45, as will be 
shewn hereafter. The mean of both may be assumed as the longi- 
tude of the Capitol — 8”-0 = 77° 2’ 00" W from Greenwich. 
