I Ching hexagram 13: Thiên Hỏa Đồng Nhân (同人, Fellowship with Others)
Hexagram 13 in the received order of the Zhou Yi is Thiên Hỏa Đồng Nhân (同人, Fellowship with Others): upper trigram Càn ☰ (Heaven), lower trigram Ly ☲ (Fire); the six lines from the bottom: yang, yin, yang, yang, yang, yang.
Upper trigram
Càn ☰ (Heaven)
Lower trigram
Ly ☲ (Fire)
Six lines, bottom up
yang, yin, yang, yang, yang, yang
Inverse
7, Địa Thủy Sư
Reversed
14, Hỏa Thiên Đại Hữu
Nuclear
44, Thiên Phong Cấu
Numbering follows the received Zhou Yi (King Wen order). The I Ching is an ancient work of philosophy.
Tong Ren (Union of Men), Hexagram 13 of the I Ching, joins Heaven and Fire. Its structure speaks of harmony, openness and shared purpose in cooperation.
Tiểu Tuyết is the 20th of the 24 solar terms, usually beginning on 22 November in Vietnam time; it is the mid-month qi of the month of Hợi (10th lunar month).
Thái Bạch is the most inauspicious star in Cửu Diệu, tied to loss and betrayal. A monthly ritual on the 15th lunar day, facing West with 8 lamps, may help.
Hà Lạc lý số casts a hexagram from the can chi of a birth date: the number tables, the 25 and 30 reductions, and a worked example from Học Năng's book.