[ 2'3 ] 



Change of ^'s A. R. for 12 hours at the rate of 6H. 33, 

 being the mid-interval of the obfervation 6°. 16'. 30 

 Its afliftant logarithm from Table II. g. 7185 



prop, logarithm of 52", 65 = 13-. 9", 7 i. 1360 



o. 8545 



prop, logarithm of 25' 9', 6, which reduced to fydereal time 

 is 25'. 13", 7 longitude weft. 



Note. — Thefe appulfes of the moon and ftar to the meri- 

 dians of Greenwich and of the Obfervatory of T. C. D. were 

 obferved with the excellent tranfit inftruments that thofe ob- 

 fervatories are furnifhed with — and reduced by a mean of the 

 five wires in the refpedive tranfit books of Drs. Mafkelyne and 

 Ufsher. 



On the ConJlruElwi of Table I. 



As the correction of the difference of the difiances of the 

 moon's enlightened limb, from the fame flar under different 

 meridians, evidently depends on the interval of the meridians, 

 combined with the moon's rate at the mid-interval of the ob- 

 fervations, the table intended to facilitate this corredion was 

 conflruded in the following manner : 



Let S be the fum of the moon's increafe in A. R. for 12H. 

 H 12 H. L the eftimate longitude, D the difference of 



A. R. 



