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
Waxing Crescent
Sunday, April 19, 2026
Illumination: 5.9% · Waxing · 2.3 days old
Next full moon: May 1, 2026 · Hoi An Lantern Festival night
April 2026
Phase guide
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.
Your Stay Awaits
Begin Your Stay at Nghê Prana
Riverside rooms, ten minutes by bicycle from the Ancient Town. Whether it's one night between Hue and Da Nang or a full week of doing nothing — we kept your room quiet.
Free cancellation · Direct from the family who built the hotel
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