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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
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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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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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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