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Why are there lunar years with no Lập Xuân solar term?
Because the calendar makers of old added 7 leap months to the lunar calendar every 19 years to keep it in step with changes in the weather. Within any 19 years there will be 7 years with no Lập Xuân solar term, 7 years with two Lập Xuân days and 5 years with one. For example, the year Giáp Thìn 2024 had no Lập Xuân solar term because Lập Xuân fell on the 25th day of the twelfth month of the preceding year Quý Mão.
From the article “The Twenty-Four Solar Terms: Why the Solar Calendar Lives Inside the Lunar Almanac, and Why It Ties to Farming”
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What Is Lập Thu, When Does It Begin, and What Customs Come With It?
Lập Thu, tiết khí thứ 13, đánh dấu chuyển hạ sang thu. Bài giải thích cách tính ngày, ba hậu, gốc tích trong Tuế thời quảng ký và tục lệ.
Tam nguyên and the 18 Ju of Qimen: How to Derive the Ju Number from Solar Terms According to the Source Texts
Tam nguyên splits each solar term into three five-day spans, each with one Kỳ Môn cục. The 24-term table follows the Hiệp kỷ biện phương thư.
The Twenty-Four Solar Terms: Why the Solar Calendar Lives Inside the Lunar Almanac, and Why It Ties to Farming
The 24 solar terms are seasonal markers tied to Earth's orbit around the Sun, used as a farming guide in the lunar almanac.
What is Tiết khí?
Solar terms are 24 markers dividing the year by the Sun's position on the ecliptic, used in East Asian calendrics to determine seasons and festivals.
What Is Vũ Thủy, the Rain Water Solar Term, When Does It Start, and What Customs Does It Have?
Vũ Thủy, second of the 24 solar terms, marks damp rain and warming soil after winter. This explains its dates, meaning, and folk customs.
When Does Lập Xuân Begin and What Customs Mark It?
Lập Xuân, the first solar term of the year, falls on 3 or 4 February (4 February in 2026). How it is calculated, why it changes the year, and its customs.
What Is Lập Đông, When Does It Begin, and What Customs Come With It?
Lập Đông is the 19th of the 24 solar terms, marking the start of winter and usually falling on 7 or 8 November each year.
When Does Lập Hạ Begin and What Customs Come With It?
Lập Hạ, the 7th solar term, opens summer when the Sun reaches 45 degrees of longitude, usually on 5 or 6 May. How it is calculated and its customs.
Building the Four Pillars of BaZi from birth date and time: the year pillar changes at Lap Xuan, the month pillar changes at the solar term, the day pillar follows the 60-cycle, and the hour stem is derived from the day stem
BaZi's Four Pillars from birth date and time: the year pillar turns at Lap Xuan, the month at solar terms, the day runs the 60-cycle.
What Is Đại Thử (Major Heat), When Does It Begin, and What Customs Come With It?
Đại Thử, the 12th solar term and mid-term of the sixth lunar month, begins when the Sun reaches 120 degrees, on 22 or 23 July. Start times 2025 to 2030.
What Is Tiểu Thử (Minor Heat)? When Does It Begin and What Customs Are Associated With It?
Tiểu Thử usually begins on July 7 and opens the Mùi month. Start times for 2025 to 2030, the meaning of its name and what classical books record.
What Is Mang Chủng Solar Term, When Does It Begin, and What Customs Are Observed?
Mang Chủng is the 9th of the 24 solar terms, usually starting around June 5 or 6 as Tiểu Mãn ends. Its meaning, calendar role, and customs explained.
What Is Hàn Lộ Solar Term, When Does It Begin, and What Customs Does It Have?
Hàn Lộ is the 17th of the 24 solar terms, beginning around October 8 when the Sun reaches 195 degrees. Learn its meaning and customs.
When Does Thu Phân Begin and What Customs Mark It? A View from Sui Shi Guang Ji and Calendrical Science
Thu Phân, the 16th of the 24 solar terms, begins on 22 to 24 September as the Sun enters the Thọ Tinh station. Its calendar roots and customs, explained.
What Are the Twelve Trực Kiến Trừ Mãn Bình Định Chấp Phá Nguy Thành Thu Khai Bế?
The twelve trực, from Kiến and Trừ to Khai and Bế, form a twelve-day cycle for judging each day, rooted in old calendars and the Hiệp kỷ biện phương thư.
How Ba Tu Major Cycles Are Set: Why They Run Forward or Backward by Gender and the Yin Yang of the Year Stem, How the Starting Age Is Counted from Days to the Nearest Solar Term (Three Days to One Year), and How to Read a Ten Year Major Cycle Together with the Annual Cycle Against the Useful God
Ba Tu major cycles are set by gender and the yin yang of the year stem, with starting age counted from days to the nearest solar term at three days per year.
What Is Tiểu Mãn, When Does It Begin, and What Customs Come With It?
Tiểu Mãn, the 8th solar term, begins on 20 or 21 May when the Sun reaches 60 degrees longitude. In 2026 it starts at 07:28 on 21 May, Vietnam time.
What Is Sương Giáng (Frost's Descent), When Does It Begin, and What Customs Are Observed?
Sương Giáng 2026 begins at 16:39 on 23 October, Vietnam time. The 18th solar term, mid-term of the ninth lunar month: dates, three pentads, customs.
Is an Online Bát Tự Chart Accurate and Should You Use It? How to Check and the Limits You Need to Know
Online Bát Tự charts build fast, but accuracy hinges on birth hour data, time zone, and solar terms. Know when to trust them and when a reader must verify.
What Is Bạch Lộ (White Dew), When Does It Begin, and What Customs Come With It?
Bạch Lộ (White Dew), the 15th solar term, starts around 7 or 8 September as night vapour condenses into white dew, marking mid-autumn in the calendar.
Why two calendars give different lunar dates for the same solar day, and where time zones come in
Two calendars can give different lunar dates for the same solar day because they use different legal time zones, such as Vietnam at UTC+7 and China at UTC+8.
What the Táng Thư Says About Qi, Wind, Water, and the Origin of the Term Feng Shui
The Táng Thư says qi scatters in wind and stops at water, hence phong thủy; water comes first, storing wind second. Read against the Chinese text.
What is Bach Lap Kim (White Wax Metal) in the Sixty Jiazi? Five Elements Meaning
Bach Lap Kim is the Na Yin for Canh Thin and Tan Ty years, a soft, noble Metal. Read its Five Elements traits, suitable colors and directions.
What is Tấu Thư in Vietnamese astrology, and does it relate to study and exams?
Tấu Thư is a minor tử vi star for papers and eloquence; it analyses its place, links with Thiên Lương and Xương Khúc, and its limits.
What Is Cửu Cung: The Nine Squares of Lạc Thư and How Divination Arts Use It
The nine palaces are the nine cells of the Luo Shu, a 3x3 square whose every line totals 15, and the grid used by Huyền Không and Kỳ Môn.
Nguyệt Kỵ and Dương Công kỵ nhật: What Hiệp Kỷ Biện Phương Thư Records and What It Rejects
Hiệp Kỷ Biện Phương Thư records Nguyệt Kỵ and rejects Dương Công kỵ nhật. An analysis of the original Chinese text, separating old rules from folk beliefs.
The Hồng Bàng Lineage and Kinh Dương Vương: What the Đại Việt sử ký toàn thư Records at Its Opening
Đại Việt sử ký toàn thư opens with the Hồng Bàng era: Kinh Dương Vương, named Lộc Tục, and the realm of Xích Quỷ. The Hán text set beside later histories.
Building a Xuan Kong Flying Star chart step by step: placing the period star in the center, flying it along the Luo Shu, taking the mountain star and facing star, and deciding forward or reverse flight by the San Yuan Long
Build a Xuan Kong Flying Star chart: place the period star in the center, fly it along the Luo Shu, set the mountain and facing stars.
What Are Ha Do and Lac Thu: Number Arrangement, Links to the Tien Thien and Hau Thien Bagua, and the Nine Stars
Ha Do arranges birth and completion numbers by direction and element, while Lac Thu is a 3x3 square where every row, column and diagonal sums to 15.
Vietnam National Day (Sep 2): Independence Day
On September 2, 1945, President Ho Chi Minh read the Declaration of Independence at Ba Dinh Square, founding the Democratic Republic of Vietnam.
Lục Nhâm Course Types: What Are Nguyên Thủ, Trùng Thẩm, Tri Nhất, and Thiệp Hại, and How Is a Lục Nhâm Divination Named?
A Lục Nhâm course type names a chart by the overcoming relations among its four courses. The four base types are Nguyên Thủ, Trùng Thẩm, Tri Nhất, Thiệp Hại.
What Is the Tử Vi Đẩu Số Toàn Thư, Who Compiled It, and Why Nearly Every Tử Vi School in Vietnam Cites It
The Tử Vi Đẩu Số Toàn Thư circulated in the Ming era, its preface crediting La Hồng Tiên with compiling it from works attributed to Hi Di Trần Đoàn.
Founding of the Communist Party of Vietnam
The founding of the Communist Party of Vietnam on February 3, 1930, when Nguyen Ai Quoc unified three communist organizations in Hong Kong.
Ho Chi Minh Communist Youth Union Day (March 26)
March 26 marks the founding of the Ho Chi Minh Communist Youth Union, honoring Vietnamese youth traditions across historical periods.
Mid-Autumn Festival for Children in Vietnam's Three Regions: How Lantern Parades, Lion Dances, and Moon-Viewing Feasts Unfold
How children celebrate Mid-Autumn in northern, central and southern Vietnam: lantern parades, lion dances and the moon-viewing feast.
Founding of the Vietnam People's Army, December 22
Learn about the history of December 22, 1944, the founding of the Vietnam Propaganda Liberation Army, predecessor of the Vietnam People's Army.
Zi Wei Dou Shu: How to Cast a Chart and the Meaning of the 12 Palaces
Discover in detail how to cast a Zi Wei Dou Shu chart from birth time and year to star placement, along with the profound meaning of the 12 palaces.
Dinh Thầy Thím Festival (Tế Thu Ceremony, Thầy Thím Death Anniversary) from the 14th to the 16th of the Ninth Lunar Month: Rituals and the Legend of Thầy Thím
Dinh Thầy Thím Festival runs from the 14th to the 16th of the Ninth Lunar Month with spirit welcoming, cộ bánh offerings, Thỉnh sanh, and Tiền hiền rites.
How Did Lý Bí Launch His Uprising and Found the Kingdom of Vạn Xuân in 544?
Lý Bí (Lý Bôn) rose against the Liang, drove out the governor and took the throne in 544, founding Vạn Xuân and opening the Early Lý period.
Thu Trang
Film actress, comedian, film producer
