Thiên Tử Vi · in English
Vietnamese astrology, lunar calendar & feng shui tools
Free, accurate tools rooted in Vietnamese tradition: build a Tử Vi chart, find your zodiac animal and element, read the lunar calendar, choose auspicious days and plan for the Year of the Goat 2027 — all calculated for Vietnam time.
Today in the Vietnamese lunar calendar is shown here when JavaScript is enabled. Open the lunar calendar.
All English tools
Birth charts
Zodiac & years
Calendar & feng shui
What makes Vietnamese astrology different
A calendar set to Vietnam time
The Vietnamese lunar calendar (âm lịch) is lunisolar: each month begins on the day of the new moon and a leap month is added roughly every three years to keep pace with the seasons. Because the new moon is fixed in Vietnam’s own time zone (UTC+7), Vietnamese and Chinese calendars occasionally disagree by a day — or, as in 1985, by a whole month.
The Cat, not the Rabbit
The twelve animals are the same as in China with one famous exception: the fourth sign is the Cat. The Ox is the water buffalo of the rice fields. Every year also carries a Heavenly Stem, giving a sixty-year cycle such as Đinh Mùi (Ding Wei) for 2027, and a nạp âm “sound element” that Vietnamese families use as a person’s destiny element, or mệnh.
Living traditions
Choosing an auspicious day for a wedding or a shop opening, inviting the right first-footer at Tết, checking a house’s facing against your Kua number: these customs are still part of everyday life in Vietnam and among overseas Vietnamese. Our tools explain each step in plain English instead of handing you a verdict.
The English section is a companion to our Vietnamese site, which has more than fifty tools. You can switch language at any time from the menu, or browse all Vietnamese tools.
Frequently asked questions
Is Vietnamese astrology the same as Chinese astrology?
They share the same roots: the ten Heavenly Stems, twelve Earthly Branches, five elements and the lunisolar calendar. Vietnam has its own traditions, though: the calendar is computed for Vietnam time (UTC+7), the fourth animal is the Cat rather than the Rabbit, and folk practices such as the Nine Ruling Stars (Cửu Diệu), Kim Lâu ages and the first-footer at Tết are especially popular in Vietnam.
What is Tử Vi?
Tử Vi (Zi Wei Dou Shu, “Purple Star astrology”) maps more than a hundred stars into twelve life palaces using your lunar birth date and two-hour birth period. It is the most respected chart-reading system in Vietnam. Our Tử Vi birth chart builds one in seconds.
Why does Vietnam use the Cat instead of the Rabbit?
The fourth branch, Mão (卯), is read as “mèo” (cat) in Vietnamese, while in Chinese it is associated with the rabbit. People born in 1987, 1999, 2011 or 2023 are Cats in Vietnam and Rabbits in China — same branch, same calculations, different animal.
Are these tools free?
Yes. Every tool on this English section runs in your browser and is free to use. Results are for cultural reference and reflection, not a substitute for professional advice.
Which time zone do the calculations use?
All lunar dates, stem-branch days and solar terms are calculated for Vietnam (UTC+7). In a handful of years this shifts a new moon to a different day than in Chinese calendars (UTC+8) — Tết 2007 fell on 17 February in Vietnam but 18 February in China.