232 



GEOGRAPHICAL POSITIONS. 



At Berlin the observed nearest distance, corrected from the influence 



of refraction and parallax, was .... 5* 40" 38 



(Mem. of the K. Academy of Berlin.) 



By the above data we find the following error of the ta- 

 bles in latitude. 



By the observation of Mr. Messier 

 Idem. at Berlin. 



Idem, in the Island of Leon. 



. — 5" 77 

 . — 5 77 



. — 6 30 



Mean error. — 5 8 



Determination of the diameters of the Sun and Mercury, conjunc- 

 tion in the Ecliptic and error of the tables in longitude. 



Ingress at Paris for the center of the earth, from the? 

 mean of the observations most to be depended upon- J 



Difference of apparent elongations .... 

 Apparent la-itude of Mercurj by the tables at the ingress 

 Correction in latitude . 



Apparent latitude of 5 



b / » 



21 17 37 

 Egress. 4 41 27 



Duration. 7 23 50 



= 1745" 18 



179 31 



— 5 80 



173 51 



Inclination of the orbit . 



Chord 



Hence nearest distance of the centers 



Angle of conjunction ar the ingress. 



\ Diameter of the sun resulting from above 



difance of the a' he time f 

 Logarithm =- : - - r — £ 



9,9971062 



Apegee — dis.ai ce ot i.e 

 Apogee diameter of the Q, resulting therefrom . . 



Time employed by the diameter of Mercury in the ingress and egress 

 Logarithmic distance of Mercury at the conjunction. = 9,74550 

 Hence The diam. of $ reduced to the mean distance of the earth from the Q 

 Apparent elonga'ion at the ingress . . = 934 416 



Aberraiion of che © — aberration of !J . = 26 662 



.6" 2988 



Elongation in the ecliptic . ..... 



Cotijunc.ion in the ecliptic ; mean time of Paris 

 Geocentric latitude of Mercury, corrected from aberration 

 Correcion of the tables to the longitude of Mercury? 

 supposing the longitude of the to be exact. J 



Longitude of the from the mean equinox at the conjunction. 

 Heliocentric longitude of Mercury 



907 775 



=1>> 08' 32" 

 = 5 44 55 



. = -f- 15 52 



— 1 16 54 26 7 = 

 7 16 54 26 r 



