Knowledge › Eastern › I Ching Liu Yao timing rules from Zeng Shan Buo Yi chapter 26D: how static lines, moving lines, excessive vigor and void in the cycle each find their day.
Updated 25 Sept 2026 Traditional systems
Knowledge › Eastern › Lunar calendar How a lunar leap month is determined, why leap years exist, and why one lunar day in a leap year corresponds to two solar days.
Updated 12 Sept 2026 Calendar and astronomy
Knowledge › Eastern › I Ching Month leader and day spirit set each line's strength in a Liu Yao hexagram, covering void in the decade, month breaker, and hidden movement.
Updated 25 Sept 2026 Traditional systems
Knowledge › Eastern › I Ching Tiến thần and thoái thần in Lục Hào: how a moving line advances or retreats within one element, with the seven pairs and cases from Tăng san bốc dịch.
Updated 12 Oct 2026 Traditional systems
Knowledge › Vietnam › Date selection Cửu Độc: nine days of the fifth lunar month (5-7, 15-17, 25-27). What the Kinh Sở tuế thời ký says, what is avoided, and solar dates for 2026 to 2030.
Updated 17 Oct 2026 Traditional systems
Knowledge › Vietnam › Historical figures Emperor Quang Trung (Nguyễn Huệ) led the Tây Sơn movement and crushed 290,000 Qing troops at Ngọc Hồi - Đống Đa in 1789.
Updated 14 Aug 2026 Culture and belief
Knowledge › Vietnam › Ancestor worship Rằm tháng 7 is when families make offerings to the Buddha, deities, ancestors and wandering souls, with guidance on timing, the tray and what to avoid.
Updated 9 Oct 2026 Culture and belief
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