diminution

For its days in eight years are less _than those of the sun by_ eighty days, which eighty days are its diminution in eight years.

The western wind has the name of diminution, because there all the luminaries of heaven are diminished, and descend.

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.

Therefore they are taken outside of heaven for three years and are not added to the number of days, because they change the time of the years to two new months towards completion, to two others towards diminution.