GEOGRAPHICAL SITUATIONS. 365 



Supposing the inflexion of the moon's semidiameter^ 1 ",.'-'• 



h / » 



We have the conj. at Paris by the observ. at Figueras of imm. & em. . =10 48 38,o 



By the observation at Milan of immersion and emersion. . . . 10 48 37,0 



Mean conjunction of y tf with £ mean time at Paris. . . . . 10 48 37,6 



Conjunction of Aldebaran by immersion and emersion at Paris, ? _ 



by the observations of M. Mechain at Figueras. . . . 3 ' 3 '' 



Conjunctions deduced from the immersion of both stars, re^ 

 duced to Paris with the inflexion=l",5, 



Conj. m. t. For-f-10" Conj. m. t. For-f-10" 



at Paris in S's paral. «t Paris. in Cs pur 



h / « * h ' u 11 



By observations at Figueras. 10 48 34,3 + 8,88 17 5102,7 — 14,50 

 Berlin. 10 48 35,3 -4- 5,30 

 Milan. 10 48 33,3 -f 7,52 



Marseilles 17 51 08,7 — 15,40 



Gotha. . 17 51 59,7 — 23,00 



Paris 17 51 02,8 — 18,10 



Mean. 10 48 34,3 -f 7,23 17 51 02,2 — lT,7i 



By this comparison it appears that the greatest reliance is to 

 be placed on the observations of M. Mecbain, and if there 

 should be the least error it cannot exceed half a second. 



If the conjunctions calculated by the tables be compared 

 with the conjunctions inferred from the immersions, there re- 

 sults, 



Correction of the longitude in the new lunar tables. ..... =_L3,5Q 



Correction of the parallax in the tables. ........ _i_o,70 



Conj. by the new tables correcting the long, of the <£ by -f-2,5=10 48 34 ( 8 17 51 01,0 

 By the observations supposing a correction of the parallax 



in the new tables of -f0,7 10 48 34,8 17 51 01,0 



Difference . . 00 00 00,0 00 00 00,0 



It is to be observed that if use were made of the parallax in 

 the Nautical Almanack, which supposes the constant equatorial 

 57' 11 ",0 that is, lo" more than the tables of Burg, the last 

 results instead of coinciding, would have differed 24y",98 in time. 



Second determination of the lunar parallax by the comparison 

 of the two immersions observed by Mecbain. 



O ' II 



Diff. of elongation, by the new lunar tables during the interval of the two imm. 5 17 03,25 

 Difference of longitudes of the stars. . . . . . . 3 59 17,62 



Effect of the parallax 1 17 45,6.. 



Sum of the elongation calculated by the parallax in the new tables. . . 1 17 44,24 



Difference 00 01,39 



