I 3« 3 





Obfervations for determining the SoUlices. 





j 



\pp. zen. Jift. 



App. zen. dift. 



Baro- j Thermo- 1 



Hence the apjn 







t'theG'sV.L. 



of the 0'sL.L, 



meter. 



meter. 1 



zen. dift. of the 















Sun's center. 







r it 



a 1 11 







1 11 



•i 7 70. 



Dec. 9. 



73 21 40.3 



13 54- 5- 1 



29.76 



37 



7J 37 52.7 





12. 



73 3 6 4'-8 



74 9 25.0 



29.78 



46 • 



73 53 3-4 





14. 



7.3 44 22-0 



74 16 58.2 



29.87 



44+ 1 



74 40.1 





21. 



73 5 6 4 1 - 



74 29 '3- 1 



2 9-37 



43 + 



74 IZ 57-o 





22. 



7 3 56 20.0, 



74 29 8.1 



29.94 



3H 



74 li 44-° 





29. 



73 42 ,27- 2 



74 15 °-4 



29.62 



43 i 



73 58 43-8 



»77*- 



Jan. 5. 



73 .18 18.0 



73 51 3.6 



29-23 



46 



73 34 4o.« 



1 77 at'. 



June 18. 



2 7 5 45-4 P7 37 4*- 2 



29.82 



64+ 



27 21 43.8 





19. 



3 7 4 52,-7 



p2 7 36 32.1 



30.03 



66f 



zj 20 42-4 





20 



27 3 5 2 -° 



27 35 44-4 



30.11 



71 + 



27 19 48.2 





21. 



2 7 3 33-6 



27 35 26.0 



30.12 



70 



27 19 29.8 





22. 



27 3 51.0 



27 35 29.4 



30.11 



67f 



27 19 40.2 





24. 



27 5 17. 1 



27 37 3-5 



30.06 



6 7 



27 21 jo. 3 





25. 



27 6 43.2 



27 38 32.0 



— . ■ » i>. 



30.04 



72! 



27 22 37.6 



By comparing thefe obfervations together, I make the "J ° ' " 



true zenith diflance Of the Sun's center, at the > 74 t6 13.4 



Winter Solftice, to be . J 



And at the Summer Solftice . * . . » . .""* 27 19 p. 6 



Therefore, the diftance of the tropics 46 56 21.8 



Half 23 28 10.9 

 By Mr. Mayer's Tables, the decrement of the obli- "^ 

 quity, in three months, is . . - J 



Hence the mean obliquity, December 21, 1770 . 23 28 11.0 

 And June -21, 1 77 1 » 23 2S 10.8 



Therefore, the latitude of the Obfervatdry, by thefe "\ g North 



obfervations, is J 



The above obfervations were chiefly taken by Mr. Bradley. Thofe which 

 follow are what I took about the time of the late oppofitions of the fuperior 

 planets, in which, as well as the preceding obfervations, the apparent zenith" 

 alliances are thofe which were taken by the 96th arc, on which we chiefly 

 depend, though the difference between the two arcs feidom arifes to more 

 than. three or four feconds. 



For 



