VOL. Lll.] PHILOSOPHICAL TRANSACTIONS. SOQ 



at Shirburn, or at 17*^ 40"^ 2,6^ apparent time at Greenwich, by making a proper 

 proportion from the computed true motion of Venus from the sun, and the true 

 latitude was then g' 34.5'' south. 



2. From the mean of 10th, 11th, 12th, and 13th observations, at ig^ 24"^ Q* 

 apparent time at Shirburn, the observed right ascension was 5' 40", and the ob- 

 served declination was 1 1' 33''.6; whence the visible longitude was 6' 52''.2, and 

 the visible latitude lO' 53''.3, from the sun's centre; and the visible ecliptic con- 

 junction was at 17^ 40"^ 23* at Shirburn, or at 17^ 44™ 24* apparent time, at 

 Greenwich, with 9" 54''.9 of visible latitude south. The parallax of longitude 

 was 13.2% to be added to the visible longitude; and the parallax of latitude 18.1'', 

 to be subtracted from the visible latitude, to give the true latitude. The true 

 ecliptic conjunction was therefore at 17^ 36™ 31* at Shirburn, or at 17^ 40™ 32* 

 apparent time at Greenwich, the true latitude being then 9' 3i'''.6 south. 



3. From the mean of the 14th and 15th observations at 19^ 47™ 29% the ob- 

 served right ascension was 7 6 .3, and the observed declination 1 1' 57'^.6; 

 whence the visible longitude was 8' 20". 5, and the visible latitude was 11' 8", 

 from the sun's centre; and the visible ecliptic conjunction was at 17*^ 41™ 30% or 

 at 17^45™ 31* apparent time at Greenwich, with visible latitude 9' 57''.2 south. 

 The parallax of longitude was 12"'.5 to be added, and the parallax of latitude 

 ]7'''.4 to be subtracted, to give the true longitude and latitude. The true ecliptic 

 conjunction was therefore at 17*^37'" 42* at Shirburn, or at 17^ 41™ 43* apparent 

 time at Greenwich, the true latitude being then 9' 33''.9 south. 



4. At the internal contact at Shirburn at 20^ 15™ 10*, if the motion in decli- 

 nation, answering to 3™ of time, be added to the declination observed at the 

 16th observation, the declination of the centre of Venus from the sun's centre 

 will be 12' 24''.4; whence the visible longitude was lO' 12".6, and the visible 

 latitude ll' 23% from the sun's centre; and the visible ecliptic conjunction was 

 at 17^ 40™ 57^ at Shirburn, or at 17^ 44™ 58* apparent time at Greenwich, with 

 9' 56".2 of visible latitude south. The parallax of longitude to be added was 

 J ]^'.6, and the parallax of latitude l6''.5 to be subtracted, to give the true longi- 

 tude and latitude. The true ecliptic conjunction was therefore at J 7^ 37™ 13* at 

 Shirburn, or at 17*^41™ 14* apparent time at Greenwich, the true latitude being 

 9'33''.l south. 



5. The 2d observation made at Greenwich being dubious, if the mean of the 

 1st, 3d, 4th, and 5th, be taken at 19'^ 48™ 39' apparent time at Greenwich, the 

 observed right ascension was 6' 52'".4, and the observed declination ll' 52''''.4; 

 whence the visible longitude was 8' 6''.1, and the v^isible latitude ll' 4%3, from 

 the sun's centre. The visible ecliptic conjunction was therefore 17^ 46™ 17* ap- 

 parent time at Greenwich, with g' 55".5 of visible south latitude. The parallax 

 of longitude to be added was 12".6, and the parallax of latitude to be subtracted 



VOL. XI. 4 D 



