for predicting Occupations of Stars by the Moon. 415 

 21 h 



For the whole Berlin lunar hour which is contained in t, we 

 take from the Ephemeris, pages IV and VI, the mean time T, 

 a, 8, the length of the true lunar hour 60'+ At, as also m 

 and n. The first quantities are to be taken with due regard 

 to the second differences, where the interpolation requires only 



From 



these convenient factors y 1 ^ 



