1838.] quoted in the Mohit. 775 



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The average epoch of the Arabic tables is then A. D. 1282 or al- 

 most precisely that of Nasir ul di'n Tu'si' before mentioned. The 

 greatest discrepancies are naturally found in the stars of least annual 

 variation ; because half a degree, the limit of accuracy in the Arabic 

 column, is in such cases equal to several centuries -.—thus for Rigel, with 

 annual variation of three seconds we cannot expect to come nearer than 

 1800" -r- 3" sa 600 years, nor in Canopus than 1800" -f- 2" = 900 



years ! 



It will be remarked that I have in some instances been obliged to 

 abandon the usually received equivalents of Arabic stars, and to select 

 others that were more conformable to the conditions. Of the farqa- 

 5 R 



