9. During its diminution on the first day its light decreases a
fourteenth part; on the second day it decreases a thirteenth part; on
the third day a twelfth part; on the fourth day an eleventh part; on the
fifth day a tenth part; on the sixth day a ninth part; on the seventh
day it decreases an eighth part; on the eighth day it decreases a
seventh part; on the ninth day it decreases a sixth part; on the tenth
day it decreases a fifth part; on the eleventh day it decreases a fourth
part; on the twelfth day it decreases a third part; on the thirteenth
day it decreases a second part; on the fourteenth day it decreases a
half of its seventh part; and on the fifteenth day the whole remainder
of its light is consumed.