ASTRONOMICAL PAPERS, 



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107 



After Venus was got within the Sun's diik, a light a 

 little weaker than that of the Sun, of a purphfh colour, 

 appeared to Mr. Horfley, to the left hand of Venus, which 

 Is really to the right, the telefcope inverting objeils. This 

 light he faw for fix or feven minutes. 



From 7" 28' 26^' to v"" 28^' -^o" aoDarent time, Mr. Dunn 



faw a very faint rim of light at Venus's exterior limb. 

 After Venus was wholly on the Sun, he faw a faint ring 

 of light furrounding her, both with the three and a half 

 feet telefcope, and Mr. Nairne^s two feet refleftor. 



When one third of Venus's diameter was entered upon 

 the Sun,, Mr. Doliond firft faw a light about the exterior 

 limb of the planet: This light, during all the time of its 

 continuance, appeared rather reddilh, and in all refpefts 

 like irregular refracted light. After Venus was wholly 

 entered upon the Sun, he faw a faint ring furrounding 



her. 



After Venus w^as wholly entered upon the Sun, and her- 



exterior limb was near one of her femidiamcters diftant 



M 





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round the planet, rather brighter and whiter than the bo- 



dy t)f the Sun. 



Fortunately, the w^eather was as favourable for theob- 



fcrvation of the eclipfc of the Sun, the next morning, as 

 it had been the evening before for that of the ingrefs of 

 Venusupon the Sun; which is of the moreconfequence, as 

 the comparifon of it with the obfervations which may be 

 made of it in the northern and eaftcrn parts of the wot' * 

 will ferve to fettle the longitudes ot thofe places, and con- 

 fequently render the obfervations which may be made there 

 of thetranfit more ufeful and valuable. 



I obferved the beginning of the echpfe at i8\ 38' . 54'', 

 and the end at 20^'* 23'. 30'^ apparent time, wnth the two 

 feet reflcclor, ufing the magnifying powder 90 times. And 

 at 19^'- 29'. 31'' apparent time, I obferved the greateft 

 eclipfe, at which time I found the remaining lucid parts of 



the Sun 15'. 15'', with DoUond's micrometer, affuming 



the 



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