62 



MATHEMATICAL and 



External Contatil;. 



Internal Contact, 



1 





h. m. fee. 



h. m. fee. 







7- lo. 54 



7. 28. 47 



by 



Hitchliiii. 



7, II. II 



- - - - 





Hirft. 



7. 10. 37 



7. 39. 28 





Dun. 



7. II. 19 



7. 29. 20- 





DoUond. 



7. II. 30 



7. 29. 20 





Nairne. 



7. 10. 58 



7. 29. 23 





Maflcclync. 



Thefe times are reduced to the meridian of Philadelphia, 

 by fubftrading ^^.o' .35 ^' from them in the following manner. 



Extcrnul Contaifl. Tnterxial Contad. 



h. 



m. 



fee. 



2. 



10. 



19 



2. 



10. 



36 



2. 



10. 



2 



2. 



10. 



44 



2. 



10. 



55 



2. 



10. 



23 



h. 



m. 



fee. 



\ 





2. 



28. 



12 



by 



Hitchins. 



- 



-. 



- 



» 



Hirfl. 



2. 



28. 



53 





Dun. 



a^ 



28. 



45 





Dollond. 



2. 



28. 



4£ 





Nairne. 



2. 



28. 



48 





Malkclyne. 



M. of all is, 2. 10. 30 2. 28. 40,6 



The mean of all the times of the external contads at 

 Philadelphia is 2^. 13 ^ 46^^65 and of the internal con- 

 tads 2h. 3i\ 28% as appears by page 49, and the diffe- 

 rence between thefe means is the obferved effed of parallax. 



h. m. fee. h. m. fee. 



3. 13- 4^',6 2. 31. 28 at Philadelphia. 



2. 10. 30 



2. 28. 40,6 at Greenwich. 



3- ^ 16)6 ^ ^' 47,4 the obferved eiTcds of 



parallax, at the external and internal conta(51:s. Therefore fay, 



As 3'. 1 5"— 1 95" thecalculatedeffe£lof parallax at the 

 external contad is to 3'. i6^'56=i 96^,6 : : So is the af- 



fumed horizontal parallax of the Sun on the day of the 



tranfit 8 ",5204 : to his true parallax on that day. And 



in like manner, as 2'. 48 



168 



8''55204: the Sun's parallax on that day. 



2^ 47^4^167^4 : : 



2. 290,034*^ 



o. 930,4600 



3. 224,0435 



a. 225,3093 



a. ^^3>755S 

 o. 930,4600 



3. 154,2155 



o. 934,QOo9^8'^,5903l hor. par. o. 928,9o6z~8",48997 hor. par. 



8^,48997 



2) 17^08058 



8",540T4 the mean hor. par. of on the day of the tranfit. 



As looooo : 101506 : : 8'',54oi4 : the Sun's horizon- 

 tal parallax at his mean diftance from the earth. 



5. 000,OGOO 

 5. 006,4917 



o. 93^,4650 



o. 937j9567=^=8"/>6875 the Sim's hor. par. ul his mean diflancefrom the earth. 



The 



i 



