Hi! Can you walk through the process of figuring out when Durin's Day would be in a given year? It seems to me like it depends on how you define when winter starts(is the solstice the beginning of middle?). I'm not sure which of those options would be most in line with Tolkien canon.
Durin’s Day 2025 — How to Find It (and What It Actually Means)
Ah, an excellent question — and a timely one, since Durin’s Day is just days away!
WARNING: Long post incoming — but worth the read if you’ve ever wondered how to actually calculate Durin’s Day.
Every autumn, without fail, this topic resurfaces in my inbox like a particularly persistent raven: “When is Durin’s Day this year?” or “How exactly do you calculate it?” So let’s finally put the mystery to rest — and this time, properly updated for 2025.
🗝️ “The first day of the Dwarves’ New Year…”
Thorin Oakenshield tells us in The Hobbit:
“The first day of the Dwarves’ New Year is, as all should know, the first day of the last moon of Autumn on the threshold of Winter.
We still call it Durin’s Day when the last moon of Autumn and the sun are in the sky together.”
Confused? You’re not alone.
Tolkien’s lunar phrasing sounds simple, but it hides a surprisingly complex astronomical riddle — and that’s exactly what makes it so satisfying to unravel.
🌑 The Forgotten Early Version
Before we dissect that line, it’s worth noting that early drafts of The Hobbit didn’t actually say “the last moon of Autumn” at all — they said “the first moon of Autumn.”
This might sound like a small change, but it’s not. Tolkien’s switch from first to last. The earlier phrasing likely mirrored the Jewish lunar calendar, which Tolkien drew inspiration from. The Jewish New Year, known as Rosh Hashanah, is connected to the new moon of autumn, but is not precisely on it. It is more accurately the first two days of Tishrei, the seventh month of the Hebrew calendar, which falls during September or October. But this earlier phrasing also fits better with our modern notation of the seasons, we'll see why later on...
Here’s the problem: a new moon is invisible from Earth.
If you can see it, it’s not new anymore.
What Tolkien describes — “when the moon and the sun are in the sky together” — can’t happen during the actual new moon. It happens after, when a thin waxing crescent first becomes visible.
One more wrinkle: visibility. The earliest unaided-eye sighting of a waxing crescent on record is just over 15 hours after conjunction — but Tolkien explicitly notes that Dwarves were often near-sighted. To be conservative (and frankly, realistic for most observers), we add ~24 hours before expecting that thin silver to be visible. That’s why Durin’s Day can’t fall on the day of the New Moon itself; it lands on the next day, and only counts when the crescent is visible with the Sun still in the sky.
That tiny sliver is what Tolkien drew on the original Hobbit dust jacket.
Day 1 of the Dwarvish New Year = the new moon (invisible).
Day 2 = IF the sun and that first crescent appear together → Durin’s Day
⚙️ The Dwarvish Calendar Makes Sense
This means the Dwarvish New Year spans at least two days — which fits perfectly with Tolkien’s phrasing. "The first day of the Dwarves’ New Year is,..." (You wouldn't use "first", if there is only one day in the Dwarves New Year, after all).
Interestingly, this two-day span mirrors Rosh Hashanah, the Jewish New Year — which, as I've mentioned earlier - is also celebrated over two days. Historically, this was due to uncertainty about the exact timing of the new month: in ancient times, the beginning of the month was declared only after witnesses reported seeing the new moon, and it took time for that message to reach Jewish communities outside Jerusalem. To ensure everyone marked the day correctly, the rabbinic court ruled that two days should always be observed.
The Dwarvish reckoning, whether by coincidence or cultural echo, follows the same natural rhythm: one day for the unseen new moon, and one for its first visible light.
Meaning, Durin’s Day isn’t the first day of the year; it follows it — that moment when sunlight and the new moon’s faint light meet.
🍂 “On the threshold of winter…”
Here’s where many readers stumble.
If the last moon of Autumn is meant literally, shouldn’t that be in December?
Not in Tolkien’s Britain.
In the old Celtic and Anglo-Saxon reckoning, winter began on November 1st, at Samhain (later All Hallows’).
The old year was divided by Imbolc (Feb 1), Beltane (May 1), Lughnasadh (Aug 1), and Samhain (Nov 1) — the turning points of the agricultural seasons.
So in medieval and early-modern reckoning, December 21st was “midwinter,” not its start. Only after the 18th–19th centuries, with scientific astronomy and the Gregorian calendar, did we shift to calling the solstice “the beginning of winter.”
Tolkien, steeped in Old English and Norse worldviews, clearly had the older system in mind. (though in earlier version of the Hobbit used our modern system - see "the Forgotten Early version" note above).
So when Thorin says “the threshold of winter,” he’s talking about the days before November 1st — meaning that Durin’s Day will often fall in late October.
📜 The Historical Durin’s Day — and the Modern One
Most Tolkien readers know that the original Durin’s Day of 2941 T.A. — the year of The Hobbit — is when Bilbo and Thorin’s Company finally opened the secret door into the Lonely Mountain.
Tolkien himself dated this event to October 19th in his notes — and that’s the day when “the last light of the setting sun” revealed the keyhole. However, he later realized the moon phases in the story didn’t align with that date.
The lunar cycle as described in The Hobbit simply doesn’t match an October 19th Durin’s Day. The timing of the new and full moons in the narrative contradicts the events leading up to it.
Tolkien tried to fix this in later editions, but never fully managed to make it astronomically consistent. As a result, several scholars and fan-astronomers today adjust the date to October 25th, which aligns better with both the narrative timeline (how long the Company spent travelling and resting) and the actual lunar phases for that year.
So while October 19th is the canonical date Tolkien wrote, October 25th is the likely astronomically accurate one for that year in the book.
🌍 The Erebor of Earth — Liepāja, Latvia
Middle-earth may be myth, but Tolkien mapped it with precision.
His annotated maps line up with real geography:
Hobbiton sits at the latitude of Oxford.
Minas Tirith shares the latitude of Ravenna.
Umbar corresponds roughly with Jerusalem.
Following that logic, Erebor lies almost exactly where Liepāja, Latvia stands today, on the Baltic Sea coast.
That’s why I standard use Liepāja as the “official vantage point" for Durin’s Day — the sky of Erebor itself (even though there is no mountain in sight there).
☀️ The Durin’s Day of 2025
In Liepāja, the last new moon prior to Nov 1st occurs on October 21st, 2025, at 15:25 (3:25 p.m.) local time.
That marks the Dwarvish New Year.
But remember: Durin’s Day itself comes the next day — October 22nd, when the thin waxing crescent becomes visible beside the sun.
At that point, the sun and the sliver of moon share the sky during civil twilight, between 15:25 and 18:19 — a very narrow three-hour window. That’s your Durin’s Day window! (in Europe)
🌎 Around the World
Anywhere in Europe, you’ll see the same pattern: that crescent will likely be visible in the late afternoon of October 22nd, during twilight.
In North America, the new moon (Dwarvish New Year) occurs on October 21st (8:25 a.m. Eastern / 5:25 a.m. Pacific), but the true Durin’s Day — when both sun and moon share the sky — will happen the next morning, October 22nd, shortly after sunrise.
In Asia - (Let's say Japan), the new moon falls on 9:25pm local time on Oct 21st. By Oct 22nd, you'll see the thin crescent in the western sky just before sunset, while the sun still lingers about the horizon - around 5 p.m. local time.
Meaning that, this year, all over the Northern Hemisphere, Durin's Day may be visible on Oct 22nd - either in the early morning (America), late afternoon/evening (Europe) or evening (Asia)
🌎 For the Southern Hemisphere
For readers in the Southern Hemisphere — New Zealand, Australia, Chile, South Africa, and beyond — the Dwarvish seasons shift with yours. While the Northern Hemisphere celebrates Durin’s Day in Prior to Nov 1st, the last new moon prior to historic winter would be prior to May 1st..
Earlier this year, that meant April 28th – 29th (2025) marked the Dwarvish New Year and Durin’s Day for the South. If you happened to watch the skies then, you may have seen that same delicate crescent hanging in the twilight — your own southern echo of Durin’s Day.
Next year, you can repeat the same calculation:
check the first new moon of autumn in your region, add one day, and look during civil twilight for the sun and moon together.
🌕 A Fun Astronomical Note
This year’s new moon — the one marking the Dwarvish New Year — is also the last before the Super Full Moon on November 5th, the brightest of the season. It’s a beautiful symmetry: the faintest light of Durin’s Day standing right before the fullest light of the year.
🍻 Celebrating the Dwarvish New Year
A small reminder for those marking the occasion:
No matter where you live in the Northern hemisphere, the Dwarvish New Year begins on October 21st — the day of the new moon.
That’s when the feast begins — time to pour the ale and lift a toast to the turning of the year! Then, as the celebrations continue into October 22nd, keep an eye on the sky for that faint silver crescent beside the sun.
Raise your glass high and say:
OCT 21:
Êrâs nar gêdul! - "Happy New Year!"
OCT 22 (when you spot sun and moon in the sky together):
“N’imnu Durin!” — “In the name of Durin!”
"Nurt Durinul gêdul! - "Happy Durin's Day!"
⚒️ How to Find Durin’s Day Where You Live
Look up the last new moon BEFORE Nov 1st for your city (May 1st if Southern Hemisphere).
Check the civil twilight hours for that day.
If you can see both the sun and the moon during that period — congratulations, that’s Durin’s Day.
Rule of thumb:
Day 1 (conjunction) = Dwarvish New Year begins (Moon invisible).
~24 hours later = first likely visible crescent.
Durin’s Day = that crescent + the Sun visible together (typically a narrow early morning or late afternoon window near civil twilight).
You’ll notice the time of the new moon is identical worldwide — the same “:25 past the hour.” That’s because it’s a global event — one precise instant when the sun and moon align perfectly in space.
Only your clock changes, depending on where you are.
So why use Liepāja at all?
Because while the moment is global, the visibility isn’t.
Liepāja represents Erebor’s latitude and gives us the clearest real-world reflection of Middle-earth’s sky.
🌅 Watching the Skies over Erebor (Liepāja, Latvia)
If you’d like to witness Durin’s Day in real time — or at least as close as we can get here on Earth — you can watch the sky above Liepāja, Latvia, the real-world stand-in for Erebor. A west-facing live webcam of Liepāja’s Baltic coast gives a clear view over the open horizon:
🔗 Liepāja Beach Cam (West Coast)
This camera faces the Baltic Sea, where the sun sets and where the thin crescent of Durin’s Day should appear beside it. If you check between 15:25 and 18:19 local time on October 22 (2025), you’ll be seeing the same sky Tolkien’s Dwarves might have looked upon from the Lonely Mountain.
⚙️ Durin Levels of Dedication
If you’ve made it this far, congratulations — you’ve reached Durin the Deathless levels of dwarvish devotion. You now know more about lunar cycles and Tolkien’s calendrical quirks than Thorin’s entire company combined.
As always, I’d love to hear where in the world you’ll be watching this Durin’s Day. Tag your location, your toast, or - better yet - your photo if you catch that crescent!
And may your lanterns burn bright, your forges warm, and your ale cold.
Ever at your service,
The Dwarrow Scholar
(Post Publish Updates: For Southern Hemisphere dates, minor typo corrections)
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