198 ON THE OBLIQUITY 



10. Observations of the sun's altitude in December, 1810. 



20th. 21st. 22& 



Obs'd Altitude o's Upper Limb,-.. 53 46 7.30 53 45 19.56 53 12 26.39 LL. 



Refraction, — 34.67 — 34.48 — 35.29 



53 45 32 '63 53 44 45.08 53 11 51.10 



Parallax,.- - ..... + &.90 + 4.90 + 5.02 



53 45 S753 53 44 49.98 53 11 56.12 



O's Semidiameter, ...... — • 16 17,45 — 16 17.50 + 16 17.55 



Cor'd. Altitude O's Center, 53 29 20.08 53 28 32.48 53 28 13.67 



90 90 90 



Zenith Distance, 36 30 39.92 36 31 27.52 36 31 46.33 



The entered y? on the 21st of December, at 22 31, Greenzvich time ; 

 therefore, repeating the preceding process we have* 



Zenith Distance,. 

 Redaction, . { «i ... 



20 th. 



21st. 



22d. 



36 30 39.92 



36 31 27.52 



36 31 46.33 



1 605 



19.10 



0.48 



36 31 4j.97 31 31 46.62 36 31 46 81 



36 31 46.62 

 36 31 45.97 



Mean zenith distance reduced to the 21st, . 36 31 46.466 



* Maximum of Declination, .......... 23 27 41.92 23 27 41.92 23 27 41.92 



Declinations, 23 26 35.87 23 27 22.82 23 27 41.44 



Differences,. 1 6.05 19.10 0.48 



