Methods of correcting Lunar Observatiom. 355 



Nat. COS. D .9859 

 Dist. .1086 



Sum 1.0945 .0393 



Diff. .8773 9.9431 



Log. cot. dist. 10.0212 



Const, log. 8.4130 



Sum 8.4166 



ouble P. L. 1 .0346 



P. L. 26" 2.6180 



Par. corr. 5' 54" 



Deduct 

 Refr. 

 Obliq. 26 1 13 



) 37" 

 J 10 



Final correction 4 41 

 Their correction, thus determined, agrees exactly with the 

 correct computation ; so that the error of the diagram depended 

 wholly on the inaccuracy of the operation, or of the instruments 

 employed. 



Example II. 



Let the distance be 103° 29^', the moon's altitude 41° 6', H^i 

 sun's 19° 4', the horizontal parallax 58' 35". P. L. 48''5. 



