230 GEOGRAPHICAL POSITIONS, 



Egress of Mercury by Mr. Andrew Ellicott, at Millers Place, 



Coenecuch River. 



Latitude 30 49 33 



Corrected latitude supposing the ratio of the polar 7 "g aq 00 



and equatorial diameters of the earth=333 : 334 £ 



Interior contact 6th of May, 1799. Mean time. 22 41 19 "> . 



Exterior contact. Certain to \ second 22 44 24 5} W 



Mean=to the egress of the center of $S . . . . . 22 42 51 7 



Longitude from Paris by an approximated calculation. . . 5 58 30 



Mean time in Paris May 7th. 4 41 21 7 



(a) Magnifying power 200 



hi 11 



Equation of time= — 3' 44" 2. Q's right ascenf,ion= 2 58 19 



Horizontal parallax of § — horizontal parallax of the ©== 7 117 



P= Parallax in longitude. . . . . -\- \ 316 



q= Parallax in latitude. . . . . -f 2 268 



It > H II U ll ' » 



Egress reduced to the center of the earth =22 42 51 7— 13, 7041 P-f 8,3865Q==22 42 52 7 

 Egress ditto. . observed in Paris. . • . . . 4 41 27 



Longirude of Miller's Place west from Paris. . • . . 5 58 34 3 



Pensacola 28" time east from Miller's Place. 

 Kio Perdido 46 do. west from Miller's Place. 



h 1 u » h ' " O r II 



Pensacola west from Paris=*(5 58 34 3— 28)=5 58 06 latitude 30 24 00 



Source of Rio Perdido. =(3 58 34 3+46)=5 59 20 . . 30 42 00 



Miller's Place 5 58 34 3 . . 30 49 33 



h ' " o ' a 



Pensacola west from Greenwich. . . 5 48 46 =87 1130 



Rio Perdido 5 50 00 = 87 30 00 



Miller's Place 5 49 14 3 = 87 18 30 



Determination of the tabular error in latitude, by observa- 

 tions of distances of limbs, observed at the observatory of the 

 Island of Leon with a heliometre and reduced to the diameter 

 of the sun 31' 43" 6. The observations published in the nau- 

 tical almanac of the Island of Leon are made before and after 

 the apparent conjunctions. — It is to be observed, that the distance 

 stated l h 38' 16" involves without doubt an error of the press, 

 of 20", which is easily noticed by a comparison with the other 

 distances. To compare the observations with the Tables, I 

 have calculated the following table of the parallaxes of lon- 

 gitude and latitude. 



