"66 CORRECTION OF 



The horizontal parallaxes at the immersion of both stars, corrcs- C57 55,7~) From the 

 ponding- to the latitude of Figucras which have been used. = £57 3j,85 Tables 



C 1 2^ 



The difference of apparent latitudes at the two immersions. . =< „ „" , 



Error which may be caused by 1" of uncertainty in the difference C n „,-<. 



of latitudes, in the sum of the elongations. • . . =x £ 



By the difference of elongations. ....... 1,39 



There results a correction of the parallax in the tables. . . =-j-l,0 



By the comb, of the imm. and em. of both stars observed at Figueras — 0,3 

 By the first re suit +0,7 



Mean correction of the parallax. . -(-0,5 



I have calculated the horizontal parallax of the moon in 

 conjunction with Aldebaran by the periodical coefficients of 

 Mr, La Place, supposing the constant equatorial 51' Ol" and 

 there results +0",5 more than that deduced from the tables, 

 which agrees with the last result. 



Examination of the mors which may influence the result of the pa- 

 rallax deduced jrom those observations. 



The elements which have a direct influence, are the differ- 

 ence of the longitudes of the two stars, and the difference of 

 the longitudes of the moon during the interval of the two oc- 

 cupations deduced from the tables. 



I have calculated with all possible care the places of the moon 

 corresponding to the moment of the two immersions observed 

 at Figueras, by the new tables, and I think I have obtained all 

 the accuracy of which the tables are susceptible. 



I have calculated also by the tables of the third edition of 

 Lalande, making use of the epochs of mean longitude, anoma- 

 ly and supplement of the node of the new tables; and the dif- 

 ference of longitudes during the interval of the two immersions, 

 differ but one second. The differences of latitudes agree with 

 the result of the tables of Burg. 



I have compared the right ascensions of the different cata- 

 logues and the Connoisance des temps for the year 1808, and 

 have moreover calculated various observations made by Mr. 

 Lalande, and the result which 1 have obtained, ascertains the 

 difference of the longitudes of the two stars within the limits of 

 0",8 and the latitudes within l". 



