352 ASTRONOMICAL OBSERVATIONS 



r 



Longitude of Havanna, by the observations compared wit!: 

 new tables published at Paris in 1806. 



r January 11, 1808. . . 5 39 34 



Occultations of stars. -^ April 5 5 39 14 



C May 2 5 39 00 



May 3 5 39 08 



tv . r < a -8 January 11. . . . 5 39 H 



Distances ot moon. -> ™ r m c on n» 



£ a tljj January 19. . . . a 39 Oo 



Solar eclipse, 1803 5 38 16 



do. 1806. 5 38 20 



Moon's eclipse, May 9, 1808 5 38 51 



—— — 5 38 55 



Bv corresponding- observations of solar eclipse 



February 21, 1803 5 39 06 



Ditto June 16, 1806 5 39 09 



5 39 07 



Havanna inferred from Philadelphia, by the chrono- 

 meter, No. 63 5 39 18 



Inferred from Veracruz, page 225 5 38 37 



Ditto from Porto Rico, page 225 5 38 34 



5 38 50 



Havanna west from Paris 5 38 57 



Passage of Venus over the disk of the Sun, June 3d, 1 769. 



Elements from Astronomical tables at . . 10h 11' 47" mean time at Paris. 



Longitude of the sun, apparent equinox. . 73° 27 18,3 



Right ascension of the sun 72 03 16 



Horary motion in 0's right ascension. . 2 34 



Relative horary motion in longitude . ■ 3 57,40 



Horary motion of Venus in latitude S. . . 35,42 



Inclination of the orbit 8 29 10,00 



Vpparent obliquity of the ecliptic . . . 23 28 11,5 



Radius vector of the earth. . 1,0151 t 



Radius vector of Venus 0,7262650 



0's semidiameter. ... . 15' 47",07 



By a previous calculation of the observations ot this passage, 

 I had determined the following elements: — 



Sun's parallax at the mean distance from the earth = 8",6;278 



Apparent conjunction, mean time at Paris = 10' 1 11' 47' 



Apparent longitude of Venus. . 73 27 18,3 



Duration of the passage between the interior contacts = 5 h 41' 54", 5 in mean time. 



or 5 41 52,1 in apparent time. 



Latitude of Venus at conjunction, north. ... 10 15,94 



The shortest distance of the centers 10 09,18 



Difference of the semidlameters of© and $ . . 15 15,89 



Sum of the semidiameters- 16 13,27 



Difference of Venus and sun's parallaxes at the passage = 21,352 



