# Ba Zi/Hour Pillar

## Hour Pillar

The Hour Pillar is used in the construction of the Four Pillars of Ba Zi (四柱八字), a method of Chinese Divination based on a person's date and time of birth:

Heavenly Stem
of
Day Pillar
versus
Time of Birth
(时辰)
H1 H2 H3 H4 H5 H6 H7 H8 H9 H10 Earthly Branch
of
Hour Pillar
11pm-1am H1 H3 H5 H7 H9 H1 H3 H5 H7 H9 E1
1am-3am H2 H4 H6 H8 H10 H2 H4 H6 H8 H10 E2
3am-5am H3 H5 H7 H9 H1 H3 H5 H7 H9 H1 E3
5am-7am H4 H6 H8 H10 H2 H4 H6 H8 H10 H2 E4
7am-9am H5 H7 H9 H1 H3 H5 H7 H9 H1 H3 E5
9am-11am H6 H8 H10 H2 H4 H6 H8 H10 H2 H4 E6
11am-1pm H7 H9 H1 H3 H5 H7 H9 H1 H3 H5 E7
1pm-3pm H8 H10 H2 H4 H6 H8 H10 H2 H4 H6 E8
3pm-5pm H9 H1 H3 H5 H7 H9 H1 H3 H5 H7 E9
5pm-7pm H10 H2 H4 H6 H8 H10 H2 H4 H6 H8 E10
7pm-9pm H1 H3 H5 H7 H9 H1 H3 H5 H7 H9 E11
9pm-11pm H2 H4 H6 H8 H10 H2 H4 H6 H8 H10 E12
• The Heavenly Stem of the Hour Pillar is obtained from the intersection of the column (Heavenly Stem of Day Pillar) and the row (Time of Birth). For example, for a person born between 5pm-7pm, with a Heavenly Stem of the Day Pillar of H3, the Heavenly Stem of the Hour Pillar will be H4.
• The Earthly Branch of the Hour Pillar is obtained from the last column (Earthly Branch of Hour Pillar) of the above chart. For example, if the Heavenly Stem of Day Pillar is H3 and the time of birth is 6.23pm, then the Hour Pillar is H4, E10.