Gsit PHILOSOPHICAL TRANSACTIONS. [aNNO J 769. 



longitude nearly 1*" 50"" 47' east of the Greenwich observatory, as concluded at 



the time of the last transit in 1761 . 



Of the Upsal Observations. — The whole day of June 3, at Upsal, was quite 



serene ; so that there was nothing to obstruct the certainty of the observation 



of the planet's immersion, but the undulation of the sun's margin, which, in an 



elevation of only 2 or 3 degrees above the horizon, could not but be great and 



inconvenient. 



The observations of the immersion by the 5 observers at Upsal were as follow : 



Mr. Stromer with a 3-foot reflector, observed the interior contact at S*" 39"" 58* 

 The separation of their dark connecting fasciola at 8 40 32 



Mr. Melander, with a 20-foot tube, observed the first approach. ... 8 22 1 

 The interior contact of the margins of the sun and Venus .... 8 39 57 

 The breaking of the connecting fasciola 8 40 12 



Mr. Bergman, with a 2 1 -foot tube, saw the separation of the fasciola 8 40 g 



Mr. Prosperin, with a 1 6-foot tube, saw the first contact at 8 22 12 



Breaking of the fasciola after the internal contact 8 40 13 



Mr. Salenius, with a 12-foot tube, observed the 1st contact 8 22 15 



This exterior contact at 8 39 46 



Breaking of the dark fasciola at 8 40 15 



The Stockholm Observations. — Here, not only the undulation of the sun's 



limb, but also the haze near the horizon, proved troublesome. However the 



observations proved better than might have been expected, and were as below : 



Mr. Ferner, with a Dollond's 10 feet tube, magnifying 90 times, 



noted the first approach at 8 24 8 



Total immersion, or the sun's horns inclosed Venus 8 41 48 



Mr. Wilcke, with a good 14 foot tube, the 1st approach 8 24 5 



Interior contact, but the edges still cohering 84] 2 



The fasciola a little thinner, but still visible 8 41 30 



The same fasciola broke, and the limbs separated 8 41 45 



Mr. Wargentin, with a 21-foot tube, in numerous fluctuating inequa- 

 lities in the sun's border, the 1st approach at 8 23 5 J 



The visible interior contact at 8 41 32 



Separation of the cohering appearance at 8 41 47" 



XLIJI. Observations of the Transit of Fenus over t/ie sun. By Dr. Alexander 

 fVilson,* Professor of Astronomy in the University of Glasgow, p. 333. 

 Besides two reflectors of Mr. Short's described below, Dr. W. had 3 other 



* Dr. Alex. Wilson, besides his professorship of astronomy, was a very respectable man in other 

 arts and sciences, author of several ingenious papers in the Pliilos. Trans, and was remarkably emi- 

 nent in his profession of a founder of printing types, an art which he carried to very great per- 

 fection. Dr. W. died Oct. 18, 1786, and was succeeded in both his professions by his ingenious 

 and learned son. 



