[ 20O ] 



Hence it is evident, that in each cafe the obferved difference 

 of the differences of A. R. is to be leffened by a quantity pro- 

 portioned to the moon's fuppofed uniform rate, and the inter- 

 val of the meridians ; the moon's rate therefore being given, 

 the abfolute quantity of the correflion will depend on the dift- 

 ance of the meridians afunder. 



Note — The whole of the fydereal interval between the paf- 

 fages of the moon's enlightened limb and the f\ar, being com- 

 mon to both places of obfervation, i' only excepted, i-t is for 

 this minute only which is the difference of the fydereal inter- 

 val between the moon and flar at the feparate places of ob- 

 fervation, arifing from the moon's motion in her orbit during 

 the interval of the paffages of the two meridians, that the effec- 

 tive corredion, amounting to 2" in this infiance, takes place. 



