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Knowledge › Eastern › Lunar calendar

When Does Hạ Chí Begin and What Customs Does It Have?

Hạ Chí begins when the Sun reaches 90 degrees of solar longitude; from 2012 to 2043 it falls on 21 June, Vietnam time. Start times 2025 to 2030, old customs.

Updated 16 Oct 2026Calendar and astronomy
Knowledge › Eastern › Vietnamese astrology

What Are the Eight Hạn in a Year, and Where Do They Come From?

The eight hạn of folk belief: Huỳnh Tuyền, Tam Kheo, Ngũ Mộ, Thiên Tinh, Toán Tận, Thiên La, Địa Võng, Diêm Vương. Which books record them, how they differ.

Updated 15 Oct 2026Traditional systems
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Hàn Mặc Tử

Romantic poet, author of the poem 'Đây thôn Vĩ Dạ'

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The 64 hexagrams of the I Ching

All 64 hexagrams in King Wen order, with Vietnamese and Han names, upper and lower trigrams, and the image.

64 rowsVersion 1.1.1
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Where the schools disagree

Each point where Vietnamese calendrical, feng shui and divination sources disagree, with the reading taken here, the competing reading still in circulation, and what changes when you compare two sources. Every reference table has to pick one; most pick and say nothing.

27 rowsVersion 1.4.0
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Types of Vietnamese offering rites

155 types of Vietnamese offering rites in 15 groups, from ancestor and death-anniversary rites, Tết and the festivals of the year to funerals, communal houses and temples, and the rites of ethnic communities; each with alternative names, timing, recipients, a short description, classification axes (cycle, social setting, beings worshipped, tradition, ethnic group, cultural region), a structured date and sourced passages on its customs. It is the key table for Nhật Nguyệt's datasets on offering prayers and rite customs.

155 rowsVersion 1.6.0
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Daily hexagram by the Gua Qi method, 1900 to 2100

Every solar day from 1900 to 2100 with its ruling hexagram under the Gua Qi method (six days seven parts), the line ruling the day, the position in the sixty-hexagram cycle, the winter solstice anchor and the minutes elapsed since it, the solar term and the cardinal hexagram line for that term. Enough to recompute every row independently.

73,414 rowsVersion 1.2.1
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Order of the sixty Gua Qi hexagrams

The sixty hexagrams that take turns ruling the days under the Gua Qi method, in order from Inner Truth at the winter solstice, with their solar month, their rank (duke, sovereign, marquis, grand master, minister) and when each takes over counted from the solstice. The lookup table for the que-ngay-quai-khi-1900-2100 dataset.

60 rowsVersion 1.3.1
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