Years in life, which are multiples of seven or nine based on the Moon's progression and Saturn's transiting cycle. The progressed Moon squares its natal position approximately every seven years and trines it every nine. Transiting Saturn follows a similar cycle relative to its natal position. Thus, climacterial periods are ages seven, nine, fourteen, eighteen, etc. Primary climacterial periods are the forty-ninth, sixty-third, and eighty-first years (doubly climacterial: 7 x 7, 7 x 9, 9 x 9). The sixty-third year is known as the Grand Climacteric and, if aspects in the natal horoscope confirm, is considered a year when life may be endangered.