17 



o 



MAT 



EMATICAL AND 



h. m. fee, 



AddforthetUff, ofmerid.ofGreenw,&NorrIton5 5, i, 20 

 TheSumglves the time for Greenwich, ifthere 



were no parallax 



14. 19 



2 



^ 



But the contad was obferved at Greenwich, at 7. ii 

 ThedifFerence is theobfervedefFe<flof paral,=:3'.i7^':iri97'' 



But this obferved efFcd: 197" is greater than the calculat- 

 ed efFe£l 189^^222 and therefore the Sun's true parallax 

 on the tranfit day is (by this comparifon) greater than the 



parallax affiimed for the calculation, and will be found 

 8^8715. 



, For 189^,222 : 197'' : : 8^',52i2 : 8^S87i5. 



In like manner, for the internal contads, after comput- 

 ing the parallaxes of 9 a C:> in long, and lat. for the refped- 

 ive places and times of obfervation, agreeable to the fore- 

 going rules, the parallaxes in latitude were reduced to their 

 proportionable fpace for acceleration, by taking the differ- 

 ence of the femidiameter of g^ and 9—918" for the radius 

 of the circle (Plate III, Fig. 6) inftead of their {nm=gy^^^. 

 In all other refpeds the operation is the fame as for the 

 external contads. 



■i 



So far concerning the neceiTary preparations. The fol- 

 lowing table contains the names of places, their latitudes 

 and longitudes, and fuch other requifites as enter into the 



comparifons for deducing the Sun's parallax from the 

 obfervations. 



■IT 



1. 



Names of 

 places. 



EXTERNAL CONTACT. 



Longitude in I'ime 



Greenwich, 

 .Spital Square, 

 Middle I'emple, 

 Kew, 



WhuKor Caftlc, 

 Shirburn Caflle, 

 Oxford, 

 (ilalti^ow, 



Slocltbolm. 



Mean 

 Norriton 



from 

 Greenwich. 



h. m. fee. 



00. 00 



^5 

 14 



from 

 Norriton. 



r J-**-H«: 



h m.fec. 



5. 1.29E. 



S' I- 4 



S' o. 15 



4-S9- 

 4- 57- 32 



4. 5^^'^S 



4. 44- i<^ 



6. 12. 15 



6. T3. 55 



iftcxt. cont. 

 app. time. 



Ai 



S.lt'44-,95 

 0.00.00 



h. 



7- 



7- 



7- 



7- 



7- 



7. 



7. 

 6. 



8. 



8. 



7- 

 2. 





CaleuJated 

 aeccleration 

 in time, by 



^ i^ iP^"^'"' 



m.fec. 



II. a 



10. 44^ 



10. 44-A; 

 8.30 



7. 4 

 5.J8 



54. %9 

 %%. y| 



24 _i 



1%. 50 



phUkfB^T^rtfT 



7 

 I 



I 

 I 

 I 

 I 



5 

 3 

 3 

 3 



a 



// 



405 

 405. 



405. 



405. 

 405. 

 405. 

 405, 

 400. 



3yB. 



403 

 ai6 



846 



841 



755 

 664 



236 

 63 z 



«53 



624 



Diff. 5. 9. 40,25 I 



187. 229 







'^r* 



i'hus 



