20* 



ON .THE OBLIQUITY 

 Twelve observations of the Sun, in August, 1809. 



article H, 



Day of 

 the 



Month. 



■Obs'd. Altitude. 





C 









Ol 















u 



0J 



C 





S 



iS 



.0 



1 .' 





o 







aJ 



u 





V-, 





03 





■u 



cd 



■ as 



Ch 



■ea i 



'' £U 



Semidia-. 

 meter. 



0's 



■ 

 Declination. 



.'Latitude. I 



Aug. 12 

 14 

 17 



19 



22 

 24 



N. 87 57 36.34 



88 33 48.73 



89 30 10.295 



S. 89 51 13.63 



'■ ;88-,-19. 58.75 



' 87 39 22. 1 5 



INCHES, j Q 



29.896 88.0 

 29.892 89.0 



29.772 91.01 



29.794 



29.830. 

 29.798 



S6.0 



87,0 

 88.0i 



1,891 

 1.394 



0/62'f 



„ + 



0.298 

 0.211 



O.Q75 



0.343 0.025 

 l.,779;O;0^4 

 2.081 '.0.341 



15 49.2 

 15 49.5 

 15 50.0 



15 50.5 

 1,5 50.1 

 15 51.5 



15 7 7.29 

 14 30 51.99 

 13 34 32.93 



12 55 53.99 

 11 .66 27.35 

 11 15 51.48 



13 20 31.237 



13 20 29.037 



13 20 32.679 



13 20 31.178 



13 20 40.255 



13 20 39.570 



13 20 33.992 

 12 47 39.337 



Mean, 13 4 6.6645 



11 



W. 



13 



w. 



181 



w. 



2P 



w: 



■23 



w. 



26 



w. 



N. 87 

 87 

 89 



3'i 89 

 88 

 87 



6 46.70 

 42 43.92 

 16 26.69 

 12 0.60 



32. 47.53, 

 30 26.35 



29.884 

 •29:914 

 29.798 

 29.834 

 &9.7V4 



88,0 

 88.0 

 85. ei 

 86.0 

 88.0 



29*770 87.0 



2.135 

 2.161 

 0.371 

 0.232 

 0.983 

 1.810 



0.41b 

 0.373 

 0. 1 07 

 0.114 

 0.213 

 0. 360 



15 



49.0 



15 



49.4 



15 



50.3 



15 



50.9 



15 



51.1 



15 25 

 14 49 



7.67 

 11.17 



1,5 20.23 

 16.2799 

 36 15.12 



15 51.96|10>33 57.63 



[12 47 41.660 



j 12 47 42.702 



|12 47 37.026 



12 47 36.608 



12 47 37.260 



12 47 40.770 



Error 'of c.ollimAtidft, 18 32.662. 



Affected of the error of centring. 



Mean, ■ 12 47 39.337 



Twelve observations of the Sun, in April and May, 1810. 



Article Hi.' 



April 



May 



N. B. 



18 



E. 



S. 



20 



E. 





22 



E 





24 



E. 



N 



,2 



E 





4 



E. 





87 



87 



16 49.80.. 



58 27,35 



88 39 26.85 



89 .19 35.70 



87 

 87 



.36 38.85 

 1 ,0.92 



i9J736 86.5 



2.2L9 



0.40 1 

 0.31 

 0.21 

 0.11 



.15-66. 7 

 1.5 56.2 

 15 55.6 

 15 55.2 



29.714 

 29.706 

 29.668 



87.5 

 86.5 

 87,0 



1.647. 

 1.093 

 0,-547 



J29.646 

 J29.690 



87.8 

 89*0 



1.937 



|2.416 



0.36 • 

 0.45 



15 53.2 

 1-5 52.7 



10 36 49.80 



11 :-]8 31.00 

 11 59 26.71 

 1^S9 36.4 2 



15 11 35.53 

 15 47 12.M666 



13 4 5.119 



[13 4 8.787 



13 4 5.143 



13 4 -5.057 



t3 



14 



6.003 

 4.320 



These observations and the following were taken -J 

 with- reference to an Horizontal mark. $ 



Mean, 13 4 6.746 



18 4 5.738 ; 



18 4 ' 7.754 



