'2'26 



GEOGRAPHICAL POSITIONS, 



Result.— Conjunction in New-Orleans. . . . . 6 34 54 1 



Difference of the latitudes at the conjunction. . . 22 01 2 



By the tables. . 22 36 



Sum of the errors. 34 8 ' " 



Difference of apparent latitudes at the moment of immersion in the island of Leon. =7 24 8 

 Errors of the tables according to the observations at New-Orleans. — 34 3 



Difference of the apparent latitudes at the immersion, 

 h ' » 



Conjunction in the Island of Leon. 

 Idem. New-Orleans. 



Difference of Meridians. 

 Result by the occultation of ~H 



6 50 



W. of Paris. Greenwich, 



h ' " h - " 



6 09 53 I 6 33 



6 09 56 6 36 



Note, The horizontal parallax of the moon in this calcula- 

 tion, as also in the calculation of Jupiter, supposes the con- 

 stant equatorial 57' 01" 0. 



Ratio of the equatorial and polar diameters of the earth 

 as 334 : 333. 



The parallax of I Sat,= horiz. parallax of Jupitcr=l" 9 



Horary motion of the moon at New-Orleans+horary geo- 

 centric motion of I Sat. of Jupiter=30' 37" 6. 



At the Island of Leon 30' 37" 7 — horary motion of the 

 Satellite during the observations, which was retrogade. 



Inclination of the orbit of I Satellite. 3° 18' 38" 



Position of the node idem. 1C 5 14 SO 



Passage of Mercury over the disk of the Sun, May 1th, 1199. 

 Calculated by Jose Joaquin de Ferrer. 



The principal object of this memoir, is to determine the longi- 

 tude of Miller's Place on the river Coenecuch (Am. Phil. Trans. 

 Vol. V. p, 197.) by the Egress o( Mercury observed by Mr. An- 

 drew Elhcott, Commissioner on the part of the United States to fix 

 the line which should divide them from the Possessions of Spain, 



The position of this point is interesting to Geography and 

 Navigation, from its vicinity to Pensaeola and the head of the 

 river Perdido. According to the map of Mr. Latbn, which 

 lias this point land down, Pensaeola is 28" of time east of Mil- 

 ler's Place, and the river Perdido 46" of time w est of Miller's 

 Place. I have calculated fifteen observations of ingress and thir- 



