Why can eight characters see marriage and which eight characters are easy to get married?

The first question: Our world is made up of heaven and earth, and people are made up of men and women. On the day of birth, heavenly stems and earthly branches represented herself and her spouse. Marriage is the relationship between yourself and your spouse and their family, which corresponds to the relationship between heaven and earth on the day of birth. These are the laws of nature.

The second question: when the earthly branch on the day of birth has a contradictory and unpleasant relationship with other earthly branches (year, month and time), it is easy to have marriage problems. It's easy for a woman to get hurt and her marriage is not smooth.