(HBO) – In July 2022, Hoa Binh province’s bamboo calendar of "khaw Doi” (khao Roi, Roi constellation) was recognised as part of the national intangible cultural heritage. This creates a great joy for not only the Muong ethnic group but also the Vietnamese people since the calendar is a long-standing demonstration of folk knowledge that has been upheld and applied to daily activities by Muong people throughout history.
Each Muong area in Hoa Binh has a different name for this bamboo calendar such as "khech Doi” (Doi book, Doi calendar) in Tan Lac, Cao Phong and Lac Son districts, or "fac ben” (notch carving) in some other places.
Culture researcher Bui Noi said for more than 1,000 years, the calendar has been shown on 12 bamboo bars that are about 25cm to over 30cm in length. The bars are inscribed with 30 notches representing 30 days in a lunar month. The notches are signs or symbols demonstrating the weather factors or astronomic phenomena believed to affect those days.
"Ngai khaw Roi” (khaw Đoi) in the Muong language means the Roi/Doi day, or the day of the Roi constellation. Locals in the Muong Bi area of Tan Lac district use the word "Doi” instead of "Roi”. The Roi constellation is the Tua Rua constellation.
Tua Rua is a folk name in the Vietnamese language for the M45 (Pleiades) star cluster in the Taurus constellation. In Vietnam, it is often seen in the early morning in the beginning of June, and can be seen above the eastern horizon in the ninth and 10th lunar months.
Millennia ago, pre-history humans of the Hoa Binh Civilisation (over 20,000 - 7,000 years ago) observed the sky, the movement of the sun, the moon, and stars, weather conditions, as well as wind and sunlight directions to serve their daily life activities.
In the following periods – Phung Nguyen and Dong Son civilisations, humans found the movement paths and rules of the sun, the moon, and stars in each season, on the basis of which they decided months and years. In particular, they realised that when the "khaw Roi (Doi)” constellation appears in the east, from which the sun rises, it’s the time for sow rice seeds.
Vietnam people have a tradition of cultivating wet rice, so worshipping the sun and observing the Roi/Doi/Tua Rua constellation to determine the right time for rice cultivation are of critically importance.
Given this, Muong people named their bamboo calendar after this star
Gongs hold a special place in the cultural and spiritual life of the Muong ethnic people in Hoa Binh province. More than musical instruments, they are an indispensable part of community rituals and collective memory, echoing through generations as a spiritual thread linking the past, present, and future.
Preserving and promoting the cultural values of the Muong ethnic group has become an urgent task in the current context, as many traditional values face the risk of fading away. This effort requires not only protecting the cultural identity but also eliminating outdated customs and developing a modern cultural lifestyle, contributing to sustainable values for the Muong community in Hoa Binh province.
The Muong ethnic culture, deeply rooted in Vietnam’s mountainous north, continues to be preserved and revitalised by dedicated individuals and communities determined to safeguard their ancestral identity.
The Muong group is one of the largest ethnic minorities in Vietnam, primarily found in Hoa Binh province. The Muong people in Hoa Binh boast a rich and diverse cultural treasure that reflects the unique identity of this ethnic group. Accounting for over 63% of the province's population, they have created and preserved numerous distinctive cultural values, contributing to their unique identity. Their cultural heritage is an invaluable asset, at the heart of their national identity, and represents a vibrant spiritual life that must be preserved and promoted in today’s modern world.
For generations, the ethnic communities of Hoa Binh province, particularly the Muong people, have preserved vibrant festivals deeply intertwined with the region’s geography, nature, and social traditions. These celebrations enrich Hoa Binh’s spiritual life and cultural identity, reflecting both folk beliefs and the intermingling of ethnic customs. Many of these festivals have endured the test of time, passed down through generations and continuing to thrive today. Among them, the Khai Ha (Going Down to the Field) festival stands out as one of the most significant events of the Muong ethnic group.
Muong calendar, known as sach doi, is an ancient folk knowledge system developed through observations of the movement of the pleiades star. This unique calendar consists of 12 bamboo sticks, each representing a lunar month. Specific days within each month are marked with distinct symbols, guiding locals in determining auspicious and inauspicious days for important activities.
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