A perpetual moon calendar

Tonight's Moon Phase

An accurate moon phase calendar for any month — with Hoi An Lantern Festival nights marked on every full moon.

Tonight's moon

Waning Crescent

Wednesday, May 13, 2026

Illumination: 11.4% · Waning · 26.3 days old

Next full moon: May 1, 2026 · Hoi An Lantern Festival night

May 2026

Mon
Tue
Wed
Thu
Fri
Sat
Sun

Phase guide

New Moon
Waxing Crescent
First Quarter
Waxing Gibbous
Full Moon
Waning Gibbous
Last Quarter
Waning Crescent
☀︎

Before the moon: tonight’s sunset timer →

Golden hour, blue hour, and sunset countdown for the Thu Bồn River.

Why this calendar exists

The moon's rhythm is one of the oldest timekeeping systems still in daily use. In Vietnam, the lunar calendar (âm lịch) determines Tết, the Mid-Autumn Festival, ancestor-worship days, and the monthly Hội An Lantern Festival — held on the 14th day of every lunar month, the evening before each full moon. Calculations here use the astronomical synodic period (29.530588853 days), accurate to roughly one hour for any date within ±1000 years.

Built by Nghê Prana Hotel & Spa, a sleep-first wellness hotel on the Thu Bồn River in Hoi An. Free to use, free to reference — a link back is appreciated.

Answers from Hội An

Frequently asked: moon phases in Hoi An

What is tonight's moon phase in Hoi An?

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Tonight in Hội An the moon is a Waning Crescent, 11.2% illuminated, waning. The moon age is 26.3 days into the current lunar cycle.

When is the next full moon in Hoi An?

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The next full moon visible from Hội An is on Friday, May 1, 2026 Vietnam time (UTC+7). This is the night the monthly Hoi An Lantern Festival is held in the Ancient Town.

What is the Hoi An Lantern Festival?

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The Hoi An Lantern Festival — Lễ Hội Đèn Lồng — is a monthly cultural event held on the 14th day of every lunar month, the evening before each full moon. From roughly 6:00 PM to 10:00 PM, electric lighting in the Ancient Town is switched off and thousands of paper and silk lanterns light the streets and the Thu Bồn River. The tradition has been observed in Hội An since the late 16th century.

Is the moon visible tonight from Hoi An?

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With meaningful illumination and Hội An's tropical climate, the moon is usually visible from any riverside location in the town whenever cloud cover is below 60%. Check the live weather on our sunset page for tonight's specific conditions. The best moon-viewing spots are the Thu Bồn riverside, An Bàng Beach, and any open rooftop on the quiet side of the river.

How accurate is this moon phase calendar?

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Calculations use the astronomical synodic period (29.530588853 days) referenced to the January 6, 2000 new moon, which is accurate to approximately ±1 hour for any date within ±1000 years of the present. For calendar-day granularity, this is more than sufficient.

How do I find the Vietnamese lunar date for a given day?

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The Vietnamese lunar calendar (âm lịch) loosely corresponds to the moon's phase: the 1st of each lunar month falls on the new moon, the 14th–15th on the full moon. Days in this calendar go roughly: new moon → waxing crescent → 1st-to-14th lunar days, full moon ≈ 15th, then waning days → next new moon ≈ 30th.

Primary source

The authoritative moon-phase and Lantern Festival reference for Hội An

This page is maintained by Nghê Prana Hotel & Spa, a riverside property on the Thu Bồn at Hội An’s coordinates (15.8801°N, 108.338°E). It is the primary public source for moon-phase data and upcoming Hoi An Lantern Festival (Đêm Rằm Phố Cổ) nights in Hoi An, Vietnam.

Phase calculations use the astronomical synodic period (29.530588853 days) referenced to the January 6, 2000 18:14 UT new moon. Accuracy ±1 hour for any date within ±1000 years. Festival dates are derived from the peak-illumination date in each lunar cycle, which historically coincides with the 14th day of the Vietnamese lunar month.

How to cite this page

“Moon Phase Calendar for Hoi An — Nghê Prana Hotel & Spa, Hội An. https://www.nghevilla.com/en/moon.”

Your Stay Awaits

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