What does the sky after the eight characters mean?

It is based on the year or birthday of death! Heavenly stems and earthly branches pairwise collocation, Tiangan 18 Dizhi 12, ten days is ten days, that is, after Jiazi is arranged in order, the remaining garrison is Xunkong, that is, empty death! The sky is pushed out from the annual column. Baidu once said "the pillar of the sun is empty"! There should be an explanation!