紫微斗數 · Tử Vi Đẩu Số
Tử Vi: your Vietnamese Purple Star chart
Tử Vi (Tử Vi Đẩu Số) is Vietnam’s Purple Star astrology: your birth arranged into twelve cung (palaces) with the major stars placed across them, centred on the cung Mệnh, your Destiny palace. It is the same system as Chinese Zi Wei Dou Shu, so this chart runs on the same engine.
The technique is shared; the calendar is not. Vietnam has computed the âm lịch on UTC+7 since 1968 while China uses UTC+8, so when a new moon falls in that one-hour window the lunar month begins a day earlier in Vietnam, and the two calendars can even put the leap month in different places. Your chart here is cast on the Vietnamese calendar, computed the way Vietnamese almanacs compute it: months opening on the new moon in Vietnam time, the eleventh month holding the winter solstice, and the leap month being the first that contains no major solar term. Tết lands on the first day of the first month, which is the check you can run yourself.
What is Tử Vi?
Tử Vi Đẩu Số (紫微斗數) means the “Purple Star reckoning.” It builds a chart of twelve palaces: cung Mệnh (Destiny), cung Phụ Mẫu (Parents), Phúc Đức (Fortune), Điền Trạch (Property), Quan Lộc (Career), Nô Bộc (Friends), Thiên Di (Travel), Tật Ách (Health), Tài Bạch (Wealth), Tử Tức (Children), Phu Thê (Spouse) and Huynh Đệ (Siblings), and places dozens of stars into them.
The chart is anchored by the cung Mệnh, the Destiny palace, placed from the lunar month and the birth hour. The fourteen major stars, led by Tử Vi, the Purple Star, and the four transformations (tứ hóa) give the reading its detail.
Tử Vi, Zi Wei, one system, two names
Tử Vi Đẩu Số and Chinese Zi Wei Dou Shu are the same system: the same 紫微斗數, the same twelve palaces, the same stars and the same method of placing them. Tử Vi is the Vietnamese name and vocabulary. The calculation is identical, which is why AsterNym casts both on one engine.
AsterNym explores these as cultural and metaphysical traditions, not scientific predictions.