Why is heavenly stems and earthly branches an ugly month in the first month of 1987?

/kloc-the first month of 0/987, heavenly stems and earthly branches was not an ugly month. On 1987, the first lunar month begins on1February 9, 987 (the first day of the first lunar month) and ends on March 10 (the 29th lunar month). According to the heavenly stems and earthly branches Chronology Law, heavenly stems and earthly branches 1987 in the first month is "Wu Bingyue" and "Xin Chou Yue" is the corresponding heavenly stems and earthly branches in the second month of the lunar calendar. Therefore, heavenly stems and earthly branches in the first month of 1987 was not a bitter and ugly month.