[ 201 ] 



H.1. 



Ma. 



S'Jh 



iJ#. 



^4 



The fimpleft form that can be devifed for explaining the 

 nature of this corredion, is to fuppofe, as in the annexed 

 figure, that the moon's enHghtened limb L', and a ftar S on 

 her parallel, apply at the fame inftant to ift meridian M, r, 

 then the true and obferved difference of A. R. will there be 

 the fame, viz. o. then let the ftar S' apply to a fecond meri- 

 dian M. 2. 3 H. diftant from the former; and let the moon 

 changing her A. R. at the uniform rate of 24' time in 12 

 hours be arrived at the point L', having receded from the ftar 



Vol. VI. C c by 



