Lunar-solar converter
Convert lunar and solar dates both ways, with leap months and solar terms.
Results for "lunar calendar"
Is the Vietnamese lunar calendar a purely lunar calendar?
No. According to calendar researcher Trần Tiến Bình, the calendar called "âm lịch" in Vietnam should accurately be called a lunisolar calendar, because it follows both the lunar cycle and the movement of the Earth around the Sun. A purely lunar calendar that follows only the lunar cycle is the Islamic calendar.
From the article “The Vietnamese Lunar Calendar Is Actually a Lunisolar Calendar: Why the Shortened Name 'Lunar Calendar' Causes Misunderstanding”
Calendar and astronomy
StartVietnamese lunar calendar
Today's lunar date, what day it is and its good hours, or any other day.
Converting Lunar Dates to Solar Dates: What the Calculation Is Based On, and Why It Is Not a Fixed Addition and Subtraction Table
Lunar to solar conversion uses no fixed addition table. It relies on the new moon point, major solar terms and legal time zones, so it differs year by year.
The Vietnamese Lunar Calendar Is Actually a Lunisolar Calendar: Why the Shortened Name 'Lunar Calendar' Causes Misunderstanding
The Vietnamese lunar calendar is actually a lunisolar calendar combining the moon's phases and Earth's orbit around the Sun.
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.
Why Does Vietnamese Tet Sometimes Differ from Chinese New Year by a Day or Even a Whole Month?
Vietnamese and Chinese Tet differ because the new moon is calculated in different time zones and leap months follow different rules.
Checking Today's Good and Bad Days by the Lunar Calendar: Principles, How to Look It Up, and the Limits of Date Selection
Xem ngày tốt xấu hôm nay theo lịch âm dựa trên can chi, trực, sao và giờ hoàng đạo. Bài giải thích nguyên lý, cách tra và giới hạn của việc chọn ngày.
Which Buddha and Bodhisattva memorial days are there in the lunar calendar?
Lunar memorial days for Shakyamuni Buddha, Guanyin, Ksitigarbha, Manjushri, Samantabhadra and other Bodhisattvas, with origins and practice notes.
What Makes the 2027 Lunar Calendar Special and How to Look Up Dates Correctly
Lunar calendar 2027: year of Đinh Mùi, Tết on Saturday 6 February 2027, no leap month. Key dates, solar terms, and how to look up dates and convert Can Chi.
Is the Lunar Calendar Science or Superstition? Two Layers of One Calendar, the Computable Astronomy and the Day-Selection Layer Added Later
Lunar dates, leap months and solar terms are verifiable astronomy, while auspicious days and lucky stars are a later day-selection layer.
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.
The Lunar Leap Month: Why It Exists, How It Is Calculated, and Why One Lunar Day in a Leap Year Corresponds to Two Solar Days
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.
What's on in Vietnam in October 2026? Festivals, lunar dates and where to go
Vietnam's October 2026 festival calendar: Côn Sơn Kiếp Bạc, Lam Kinh, Katê, Sene Dolta, Hanoi Autumn Festival, Keo Pagoda, plus lunar dates.
Born Before or After Tết: Which Age Counts? The Difference Between the Tử Vi Lunar Year and the Bát Tự Lập Xuân Marker
Tử Vi dates the birth year from the first day of Tết, Bát Tự from the Lập Xuân solar term. How each fixes age and why some births shift stem-branch year.
Can You Celebrate the Full Moon of the First Lunar Month on the 13th or 14th, and Where Does the Early Offering Custom Come From?
Is offering the First Full Moon on the 13th or 14th lunar day acceptable, where does the early custom come from, and what should the tray include?
How did the Nguyễn dynasty's Khâm Thiên Giám make calendars and record heavenly signs?
Nguyễn dynasty Khâm Thiên Giám compiled and issued calendars and logged heavenly signs; Đại Nam thực lục records its ranks.
Casting a Mai Hoa hexagram from the lunar year, month, day, and hour: formulas, a full worked example, and the points where books still differ
Mai Hoa Dịch Số casts a hexagram from the lunar year, month, day, and hour: divide by 8 for the trigrams and by 6 for the moving line.
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.
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.
What Is Đại Hàn, When Does It Begin, and What Customs Are Observed?
Đại Hàn is the last of the 24 solar terms, at solar longitude 300 degrees and lasting about 15 days. Here its calculation, customs, and meaning are explained.
Practical Guide: How to Choose Auspicious Dates and Times for Weddings and Groundbreaking in Vietnamese Folk Belief
How to choose auspicious dates and times for weddings and groundbreaking in Vietnamese folk belief, with lunar calendar tips and simple rituals.
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 Kinh Trập, When Does It Begin, and What Customs Are Associated With It?
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.
What Is Tiểu Tuyết (Minor Snow), When Does It Begin, and What Customs Come With It?
Tiểu Tuyết is the 20th of the 24 solar terms, usually beginning on 22 November in Vietnam time; it is the mid-month qi of the month of Hợi (10th lunar month).
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.
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 Time Is the Hour of the Rat? A Table Converting the 12 Traditional Watch-Hours (十二時辰) to Clock Time
The Hour of the Rat runs from 11 p.m. to 1 a.m. A table of all 12 watch-hours in clock time, plus the two ways of setting the day boundary at midnight.
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.
The Waxing Crescent Moon: Meaning in Astrology and Life
The Waxing Crescent Moon is the phase right after the New Moon. In astrology it is a time to plant seeds of intention and take small, decisive actions.
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.
How Is the First Death Anniversary (Tiểu Tường) Date Calculated in a Year with a Leap Month?
Tiểu tường keeps the lunar date of death in the next year, as Gia lễ does not count leap months; some count a full 12 lunar months, one month earlier.
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.
Born in a leap month or the hour of Tý: which month and day should a Tử Vi chart be cast by?
Born in a leap month or in the hour of Tý: which month and day does a Tử Vi chart use? What each book says, and the convention Nhật Nguyệt follows.
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 Đại Tuyết, When Does It Begin, and What Customs Are Observed?
Đại Tuyết, the 21st solar term, begins at solar longitude 255 degrees, usually on 7 December, opening the Tý month. Start times 2025 to 2030, Vietnam time.
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.
Comparing Lunar New Year of the Kinh, Chôl Chnăm Thmay of the Khmer, and Ethnic Groups Celebrating New Year by Their Own Calendars
Comparing Lunar New Year of the Kinh, Chôl Chnăm Thmay of the Khmer, and ethnic groups with their own calendars: timing, offerings, rituals, and names.
What's on in Vietnam in November 2026? Festivals, lunar dates and where to go
November 2026 (23rd of 9th lunar month to 22nd of 10th) brings the Thái Nguyên Tea Festival, Gia Lai Gong Festival, Ok Om Bok, Kathina and more.
Choosing Year-End Dates: Year-End Gathering, Altar Cleaning, Debt Repayment, and New Year Opening
Year-end dates for the gathering, altar cleaning, debt repayment and New Year opening: lunar calendar principles and flexible use without superstition.
Vietnamese Lunar New Year Customs and the Meaning Behind Each Ritual
Vietnamese Lunar New Year customs: the Kitchen Gods send-off, New Year's Eve rites, first-footing, and lucky money, with the meaning behind each.
Choosing Auspicious Times and Directions for the First Outing of the Year: The Lucky Customs of Tet's First Day
The first outing and calligraphy of the new year are Vietnamese luck-bringing customs. See how times and directions are chosen by lunar calendar and deities.
What Is Cửu Độc in the Fifth Lunar Month, What Is Avoided, and Where Did It Come From?
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.
What to Offer at the Rằm of the Twelfth Lunar Month and How It Differs from an Ordinary Rằm
Rằm tháng Chạp, the year's last full moon, brings simple offerings to Thổ công and ancestors for thanks and peace, in a tất niên spirit.
First-day Tet travel for the 2027 Lunar New Year: how to choose the hour and direction, and where sources disagree
First-day Tet travel for 2027: how to choose the hour and direction, prepare offerings, and follow the route, plus why sources disagree on the calculations.
Prayers for the 15th Day of the 7th Lunar Month: What the Three Texts Cover, Ritual Order, and What to Know
Rằm tháng 7 prayers include three texts for deities, ancestors, and wandering souls, with ritual order, offerings, and how to recite them.
Vietnamese lunisolar calendar, 1900 to 2100
Every solar day from 1900 to 2100 with its lunar date, leap month flag, day and year stem-branch, the solar term in force and the day officer.
Vietnamese festivals mapped to solar dates, 2026 to 2030
The actual solar date of each festival across five years, with the weekday. Lunar festivals land on a different solar date every year, and this table works that out in advance.
Vietnamese festivals, seasonal feasts and public holidays
Vietnamese folk festivals, seasonal feasts and public holidays, each with its fixed lunar or solar date.
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.
Folk inauspicious days mapped onto solar dates, 2026 to 2035
Every solar day across ten years, showing whether it falls on Tam Nuong, Nguyet Ky, Sat Chu or Tho Tu, with the lunar date and stem-branch for checking.