How to treat eight characters (want to know the two corresponding to eight characters, such as Xin Wei)?

The composition of the hourly heavenly stems and earthly branches is regular, the trunk and branches have a period of 60 hours, and the ground branches are fixed according to 12 hours every day. For example, the sky is dry (one cycle is 60 hours) and the time is 13- 15. Xin belongs to gold (yin gold), not soil (yin soil).