'29 S 



FURTHER OBSERVATIONS ON THE 



By the duration between the beginning and end of the eclipse, at Kinderhook 

 we find the sum of the horiz. semid. reduced to the time of the conjunc- 



If we suppose that the true duration was greater than what was ob- 

 served, by 4", which appears very probable, we shall have. 



By the observation at Natchez, supposing the beginning 4" before? 

 it was perceived by Mr- Dunbar. ..... 3 



32' OS" 39 



32 



32 



09 

 09 



17 



00 



Sum of the horiz. semidiam.in conjunction by a mean of the observations 32 09 08 

 Comparing these sums and differences of semidiameters with the tables 

 we find the correction of the semidiameter of the 2). . — 1" 93 

 Idem ©. . — 1 87 



The occultation of Spica Virginis, May 24th, 1801, was 

 observed in all Europe, the observations most to be confided in 

 and the most proper to determine the diameter of the moon 

 are the following. 



At the National Observatory at Paris by M. Mechain- 

 Military School 



Royal observatory in the island of Leon. 



Making use of the elements of the new tables, I find 



Conjunction in Paris (National Observatory) mean time = 10'' 02' 47" 

 Island of Leon (Royal Observatory) . 9 28 37 



Difference of meridians. 



00 34 10 7 



Difference of latitudes in conjunction by the observations? 

 in the island of J .eon. ...... 5 



Correction of the semTdiameters of the 3) by the observations of 

 M. Mechain, combined with the difference of latitudes observ- 

 ed in the island of Leon. 



By the observations in the Military School. . . . . 



51' 19" 5 



=— 2 

 — 1 65 



Mean correction. — 1 82 



I have also calculated the annular eclipse, April 1st, 1764, 

 by the new tables, and have deduced 



Correction of the semidiameter of the 2> = — 1" 35 

 Idem © — 2 15 



Recapitulation of the diffci'ent results. 



By total eclipse 1806. 

 Annular eclipse 1764. 

 Occultation of Spica Virginis above. 

 Passage of Mercury page 232. 



Mean correction- 

 Semidiameter of the © in apogee by the tables. 

 Correction by the above observations. 



Semidiameter of the © in apogee. . . 



Therefore diameter of the © in apogee- 



Correction of the diameters. 



0- 2). 



1" 87 „ . 1" 93 



2 15 . . 1 35 



. 1 82 



1 50 



1 84 



1 70 

 15' 45" 50 

 1 84 



15 43 66 



31 27 32 



