[209] 



duded from the fum of the incrcafe of the 3)'s A. R. in 12H. 

 apparent time; that the remainder may correfpond to the 2d 

 term of the analogy (viz. 12H.) in M. G T. and thus the 4th term 

 of the proportion, namely the difference of longitudes, will alfo 

 come out in this equable aftronomic meafure of time. This 

 corredlion will take place wherever the diurnal difference be- 

 tween mean and apparent time is great enough to make any 

 fenfible difference in the firfl term of the proportion. 



The refult thus obtained, will however require a fmall cor- 

 redlion in the amount of the longitude, as found by this lunar 

 problem. 



For as 24H. M. O T. amount to 360. 59. 8 =!=, and as the 

 whole asquator comprizes but 360°. iH. of M. O T. fhould 

 indicate 15°. 2'. 8". of the asquator, and as terreflrial longitudes 

 arc counted at the rate of only 15" to an hour, the longitudes 

 given in M. G T. fhould be corredcd according to this differ- 

 ence, and the quantity of this correction will be readily fhewn 

 by the tables for converting M. folar into fydereal time. 



Or perhaps it may be as ready a way to reduce the 12H. 

 of M. folar time into fydereal before the proportion is made, 

 and thus the three firfl; terms in the proportion being in this mea- 

 fure of time, the fourth will confequently come out in the 

 fame, and no further corredion be required. 



Vol. VI. 



D d 



Take 



