19. During three months it effects in thirty days _each month_ its
period; and during three _more_ months it effects it in twenty-nine days
each. _These are the times_ in which it effects its decrease in its
first period, and in the first gate, _namely_, in one hundred and
seventy-seven days.
20. And at the time of its going forth during three months it appears
thirty days each, and during three _more_ months it appears twenty-nine
days each.
21. In the night it appears for each twenty _days_ as _the face of_ a
man, and in the day as heaven; for it is nothing else except its light.