_,^ 



f" 



/ 



74 



MATHEMATICAL and 



.'Mean Time. 



h. m. fee. 

 At 5. 4-3. 17 



6. 3:1. 18 



6* 33- 55 



7. 9. 26 





Nearcft Diftance of the Ct 



of and ? . 

 m. fee 



10. 14,1a 



11. 14,19 

 II. I3>23 



JZ. II583 



;ntcr 



Nearcft Diftance of the Limb« 



of and 5 . 

 m, fee. 



5- M3 

 4. 1,46 



4. 3,4^ 

 3- 5M 



" I meafured the diam. of Venus 



on the Sun, and found 



it to be 55^^42. 



lalfo 



frequently i 



neafured the diam. of 



the Sun, on the day of obfervatlon, and the next day, and 

 found it to be 3 1 '. 3 1 ",30. 



" From thefe data, I fhall attempt to deduce the Sun's 

 par, except that I fhall make no ufe of the meafureat 6\ 

 32'. i8'\ which Ifufpeded was not accurate at theinftant 

 it was made, wherefore I immediately made another mea- 

 fure, viz. at 6\ 33' 'SS^'* 



" The neareft dift, of the limb of the Sun from that of 



^ 



^ 



Venus at 5^. 43'* 17 

 And at 6 33. S3 



II 



mean time compared together, 



give the apparent neareft dift. of their centers 10'. 3^,7, or 

 603^^,7, and the parallax of Venus was at that time fouth 

 6",9i nearly. Therefore, the geocent. neareft dift. of 



their centers was 6io",6i. Then, 



" As 72626,3 the relative neareft dift. of Venus from 



the Sun, 



(< 



Is to 28894,9 her dift. from the earth. 



*' So is 6 10", 6 1 the geocent. neareft dift. of the cent. 

 of the Sun and Venus, 



To 242^936~4^ 2^',936, the heliocent. dift. of 



W —u. 



i 



their centers at the neareft approach. 



" As Sine 3". 23^ 20^' the given inclin. of Vcnus's or- 

 bit to the ecliptic: Is to Radius, 



" SoisS, 242''5936, the heliocent. dift. of the cent, of 

 the Sun from Venus, at the middle of the tranfit. 



To the Sine of 410^5^ i^ 8/. aj^the Sun's difk, 



from the node of Venus at the ecliptical conjunction. 



" As S, of i^ 8 

 of Venus, 



/ 



2S% 



the Sun's dift, from the node 



" Is to 10'. io^',6i, the geocent. neareft dift, of their 



centers 



(( 



So 



f 



