( \%7 ) 
« Yet (till this Fault is Artificis, not Artis : For 
“ obferving the Period of the Lunar Inequalities * 
“ which is performed in eighteen Years and eleven 
“ Days, or two hundred and twenty-three Lunatic 
“ ons j it is found that the Returns of the Eclipfes,- 
“ and other Phenomena of the Moon’s Motion, are 
« very regularly performed ; fo that whatever Error 
“ you found in a former Period, the fame is again re- 1 
“ peated in a fecond, under the like Circumftances of 
“ the fame Diftance of the Moon from the Sun and 
“ Apogaon, 
“ Thus, from the Obfervation made of theE- 
“ clipfe of the Sun, which was June zz, 1 666, in 
“ the Morning, feen at London and Dantzick , I 
“ was enabled to predict, with great Certainty, that 
“ other, which I obferved July z, 1684, by al- 
“ lowing the fame Error I found in the Calculus 
“ of the former. And the like with equal Certainty 
‘‘ will do, in the Cafes extra Syzygias, when the 
“ Mean and Synodical Anomolies are nearly the 
“ fame, about the fame time of the Year. 
“ Being thus affured, from the Certainty of thefe 
“ Revolutions, that all the intermediate Errors of our 
“ fables were not uncertain Wandring?, but regular 
“ Faults of the Theories ; I next thought how I might 
“ beft be informed of the Quantity and Places of thefe 
*« Defers: That being apprized how much, and which 
‘‘ Way my Numbers erred, I might apply the Dif- 
“ ference, fo as at all times to reprefent the true Mo- 
fc tion of the Moon. Nor was there any other Way, 
<c but from the Heavens themfelves, to derive this 
“ Correftion, by a fedulous and continued Series 
B b % “of 
