624 



PHILOSOPHICAL TRANSACTION*. 



[anno 1790. 



own observations I786. In the column b, M. de la Lande's observation of 1769 

 is taken as the first ; the series c is begun with Mr. Horrox's determination of 

 1639; and in the series d, M. Cassini's observation 1698 is taken as the basis. 



If the mean be taken of these 4 means, the annual motion of Venus's node 

 will be 30.37'', or nearly Si'', adopted in the tables of Halley and De la Lande. 

 1. The greatest inclination of the orbit of Venus to the ecliptic. 



In the first place are set down the observed geocentric longitudes and latitudes, 

 corrected for aberration and nutation. 



Mean time at Copen- 

 hagen. 



1781, 



1782, 

 1783, 



1784, 



1785, 

 1786, 



1788, 



July 20 



24 



30 



31 



Aug. 1 



4 



July 13 



Nov. 5 



Sept. 19 



20 



26 



Oct. 2 



May 18 



Sept. 8 



20 



25 



July 29 



Nov. 27 



June 19 



24 



29 



July 1 



14 



May 6 

 7 

 9 



h. 







1 



I 



1 



1 



1 

 21 

 22 



2 



2 



1 



1 

 22 













 20 

 21 



1 



1 



1 



1 



2 



3 



3 



3 



m. s. 



1 40 

 5 45 



11 ]8 



12 9 

 12 58 

 IS 21 



9 19 



50 43 



4 d7 



2 2 

 43 58 

 22 5S 



29 58 



30 11 



37 n 



39 57 



53 21 



29 57 



43 7 



49 20 



55 7 



57 17 



9 7 



24 

 17 



4 



Geocentric longi- 

 tude of ? . 



s o 

 4 11 



16 

 23 

 24 

 25 



29 



10 



29 



3 



4 



5 



6 



7 



24 



9 

 15 



22 



9 

 21 

 27 



3 



6 

 21 







1 



3 



10 49 



5 52 



28 41 



42 29 



55 54 



37 13 



54 17 



46 25 

 52 29 

 15 51 



55 9 

 20 38 



1 56 



45 11 



40 27 



52 59 



5 27 



30 40 



39 32 



44 41 



47 42 

 13 9 

 54 24 

 23 44 

 28 48 

 38 13 



Geocentric 

 latitude 

 of ?. 



24 

 27 

 29 

 29 

 29 

 29 

 12 

 21 



3 

 10 

 50 

 20 

 28 

 20 



6 



57 



3 53 



37 

 30 

 35 

 38 

 39 

 37 

 43 

 44 

 46 



46 N 



21 

 21 

 36 

 21 

 4 

 22 s 



11 N 



1 S 



26 

 19 

 29 

 35 s 



2 N 



15 

 50 

 17 s 

 43 N 

 40 N 

 52 

 54 

 45 

 40 

 15 N 

 22 

 26 



