Đông Sơn bronze drums: their dating, casting techniques, star motifs, Lac birds and frog figures, and what these reveal about ancient Vietnamese beliefs.
The story of Lạc Long Quân and Âu Cơ, the sack of one hundred eggs, as recorded in Đại Việt sử ký toàn thư and Đại Nam quốc sử diễn ca, and what is myth.
Nhị thập bát tú trực nhật assigns 28 stars to rule days in a cycle, tied to diễn cầm and date selection. This article analyses its origins and calculation.
Fertility worship in Vietnam, or tín ngưỡng phồn thực, hopes for flourishing life and harvests. It appears in Linga–Yoni symbols and the Trò Trám festival.
Kinh Trập, the third of the 24 solar terms at solar longitude 345 degrees, usually begins March 5 or 6. Origin of the name and start times for 2025 to 2030.
Hà Lạc lý số casts a hexagram from the can chi of a birth date: the number tables, the 25 and 30 reductions, and a worked example from Học Năng's book.