A History of Time in the Known World #
Thesis The Nithians did not merely build an empire — they built the clock the Known World still runs on. The 336-day solar year and the 28-day lunar month are astronomical facts of Mystara, shared by everyone. But the packaging of those facts — twelve months of twenty-eight days, four weeks of seven, the seven weekday names, and the month-for-month framework — is a Nithian cultural invention that spread by conquest and contact, outlived the empire that made it, and survived even the Spell of Oblivion that erased Nithia from living memory. Cultures kept the calendar and lost the reason for it. They then re-attributed it — to Thothia, to Thyatis, to their own founders — never realizing they were all still keeping Nithian time.
I. Two layers: the sky, and the packaging of the sky #
The single most important move in this project is to separate what is astronomical (true for everyone, because everyone shares one sky) from what is cultural (a choice, and therefore a fingerprint of who influenced whom).
The sky (shared by all):
- A 336-day solar year.
- A 28-day lunar month — one full cycle of Mystara’s moon, with the full moon falling mid-month (~the 15th).
The packaging (the Nithian Meridian):
- 12 months × 28 days (= 336). The astronomical year, divided to match the moon.
- 4 weeks × 7 days per month — the seven-day week.
- The seven weekday names: Lunadain · Gromdain · Tserdain · Moldain · Nytdain · Loshdain · Soladain.
- Month-for-month correspondence across cultures (Nuwmont = Alphamir = Amai = Jolmund …).
The sky forces the year-length and the lunar month on everyone. It does not force twelve months over thirteen, four-week months, a seven-day week, or those particular weekday names. Those are arbitrary, and where we find them shared, we are looking at transmission, not coincidence.
II. How the calendar spread #
The Nithian framework reached the Known World by two roads, both well dated in canon.
| Date | Event | Road |
|---|---|---|
| ~3000 BC | Great Rain of Fire | (Backdrop: the catastrophe every culture remembers — see Gathering 1, below) |
| ~1500 BC | Nithian colonies seeded across the future Known World (e.g. Traldar lands / Karameikos) | Conquest |
| ~1000 BC | Northern Reaches human cultures conquered and enslaved by Nithia (GAZ7 timeline) | Conquest |
| ~1000 BC | Nithia’s slaves include the proto-Thyatians | Conquest |
| ~1050–1000 BC | Nithian–Old Alphatian contact; Alphatian Landfall (Alphatian Year 0 = 1000 BC) | Contact |
| ~1000–500 BC | Peaceful Nithian–Alphatian trade period | Contact |
| ~500 BC | Nithian Empire collapses; the Spell of Oblivion erases Nithia from memory | (The forgetting) |
| 0 AC | First Emperor of Thyatis crowned | (Re-attribution begins) |
Conquest handed the calendar to enslaved peoples who kept it after liberation: Thyatis (then re-stamped it with its own founding date) and the Northern Reaches (who renamed the months in Norse but kept the 12×28 skeleton).
Contact handed it to Alphatia. The Old Alphatian calendar was calibrated to a different solar system — useless, even magically dangerous, on Mystara, where spell timing and ritual cycles depend on the local sky. At Landfall the Alphatians adopted the calendar the Nithians had already spent centuries calibrating to Mystara. They did not do it out of admiration; they did it because their own clock was broken.
III. The evidence #
1. The matching test #
The Thyatian and “Alphatian” calendars match day-for-day, month-for-month. Two explanations exist: coincidence, or common origin. Since the Thyatians were Nithian slaves and the Alphatians adopted the Thothian (= Nithian) calendar, common origin is overwhelming. The match is not a publishing artifact — it is a family resemblance. → Calendar, Thyatis · Calendar, Alphatia
2. The Thothian preservation #
What Alphatia calls the Thothian Calendar predates Thothia as an independent state. Thothia is a Nithian colony that survived the Spell of Oblivion with memory dimmed rather than erased — so the calendar passed through it intact. The Alphatians, unable to remember Nithia, attributed their borrowed calendar to the only Nithian-adjacent culture they still recognized.
3. The lunar lock #
The 28-day month is lunar, and we can prove it from inside the texts:
- Glantri and Rockhome both state in-world that a month is one full-moon cycle.
- Rockhome dwarves say outright their calendar is derived from the human calendars, and in Dwarvish lin = “moon” = “month.”
- The full moon lands on the 15th in both Thyatis (15 Felmont, Day of Valerias, “a day of the full moon”) and Ethengar (15 Lingmai / Felmont, “The Gathering,” blessed “by the light of the full moon”). Same month, same day, same phase, two cultures. → Calendar, Glantri · Calendar, Rockhome · Calendar, Ethengar
4. The week as fingerprint #
The seven-day week and its seven names recur identically across Thyatis, Alphatia, Glantri, Rockhome — and even the nomadic Ethengars, who translated their month names into their own tongue but adopted the weekday names wholesale. A culture inventing a calendar from scratch does not independently arrive at Lunadain–Soladain. The shared week is the clearest single fingerprint of the Nithian Meridian. → Calendar, Ethengar
5. The control case — the Shadow Elves #
The strongest evidence comes from the one people the framework never reached. The shadow elves were already sealed underground when the Meridian spread across the surface. Their calendar:
- still runs 336 days — because that is the real solar year;
- but packages it as 14 months × 24 days, not 12 × 28;
- has no week and no day-names at all;
- and has no lunar month — because, alone among Known World peoples, they cannot see the moon.
Read as a controlled experiment: remove the moon, and the 28-day month disappears. The one culture without sight of the moon is the one culture without a 28-day month. This is as close to proof as the canon allows that the universal 28-day month is lunar — and the absence of the week marks a people isolated from Nithian contact. The exception proves the rule twice over. → Calendar, Shadow Elves
6. The Ylaruam irony #
The Alasiyan people of Ylaruam are the most direct Nithian descendants in the Known World — and they have the calendar least connected to Nithian origins, because they lost it twice: first to the Spell of Oblivion (~500 BC), then to Al-Kalim’s religious reformation, which replaced the old reckoning with lunar Hijra-style months. The Thothians, who merely dimmed, are in this sense more faithful to Nithian heritage than the Ylari, who descend. → Calendar, Ylaruam
IV. The Spell of Oblivion and the re-attribution of time #
When the Immortals erased Nithia (~500 BC), they erased not just records but memory — which is why even oral tradition lost the origin. The calendar, being a tool in daily use, survived the erasure that the story did not. Every inheriting culture was left holding a clock with the maker’s name filed off.
So each one re-stamped it with its own founding event. The structure is Nithian and shared; the epoch is local and political — a calendar is a claim of identity.
| Culture | Epoch event | Date | In CY/AC 1000 |
|---|---|---|---|
| Thyatis | Crowning of the first Emperor | 0 AC | 1000 |
| Alphatia | Landfall (counts from Alphamir 1) | Year 0 (= 1000 BC) | ~2000 |
| Northern Reaches | Cnute unites Ostland | 478 AC | 522 CR |
| Vestland | Otar founds the kingdom | 614 AC | 386 OR |
| Soderfjord | Council of Soderfjord | 950 AC | 50 CC |
| Shadow Elves | Discovery of the Refuge of Stone | 1104 BC | 2105 |
| Ethengar | (12-year animal cycle; civil New Year 6 Chagai) | — | Year of the Tiger |
| Milenia (Hollow World) | Arrival / Second Empire (in “circles”) | — | 1114th circle = 1014 AC |
V. The divergence spectrum #
Every catalogued calendar can be placed by how far it sits from the Nithian standard — a single axis that organizes the whole corpus.
| Calendar | Structure | Names | 7-day week | Distinctive layer | Distance |
|---|---|---|---|---|---|
| Thyatis | 12 × 28 | Thyatian | yes | (the reference) | Standard |
| Darokin | 12 × 28 | Thyatian | yes | trade lingua franca | Standard |
| Karameikos | 12 × 28 | Thyatian | yes | Traladaran holidays | Standard + local |
| Alphatia | 12 × 28 | Alphatian | yes | Day Magic Fails | Renamed standard |
| Glantri | 12 × 28 | Alphatian | yes | elven horoscope/zodiac | Renamed + overlay |
| Rockhome | 12 × 28 | Dwarven | yes | admits human derivation | Renamed (admitted) |
| Northern Reaches | 12 × 28 | Norse | yes | Heldann keeps Thyatian names | Renamed (constructed) |
| Ethengar | 12 × 28 | Ethengar | yes (same names) | 12-yr animal cycle; asymmetric seasons | Renamed + indigenous reckoning |
| Five Shires | Hin internal + Thyatian for trade | Hin | — | explicit dual-use | Parallel + lingua franca |
| Minrothad | ~10 months / anomalous length | guild | — | multi-racial Mitwok | Divergent structure |
| Ylaruam | lunar Hijra months | Alasiyan | — | twice-erased | Severed |
| Milenian (HW) | floating-continent orbits | Immortal-named | no | built from scratch | Null case |
| Shadow Elves | 14 × 24 | verse-named | no | no lunar month | The exception |
VI. The null cases #
Two calendars could not have derived from Nithia, and both are instructive:
- Shadow Elves — isolation underground (see III.5). The control group.
- Milenian (Hollow World) — the Milenians left for the Hollow World before the Spell of Oblivion, lost all outer-world reckoning, and built a calendar from the orbits of floating continents (Cassia, Tama, Kjell) with no sun or seasons to anchor it. (Note: the only published Milenian calendar is a community construction by Michael Ray Johnson, deliberately fitted to 336 “sleeps” per circle so it converts to the Thyatian year — useful as a designed zero-point, not as canon evidence.) → Calendar, Milenian
VII. Open questions and future layers #
- Constructed calendars (Sind, Atruaghin): no canon calendar exists; both can be built from the thesis the way the Northern Reaches was — Nithian skeleton, indigenous naming, local epoch. → Calendar, Northern Reaches
- The B10 ↔ Gazetteer reconciliation (Wangalade’s point): the inconsistency authors can’t agree on is itself evidence of a calendar that was adapted, not organically developed — the seams of a borrowed instrument. A dedicated reconciliation note is the natural “Layer 4.”
- The unified conversion framework: master conversion tables across all reckonings (the Calendar, 372-Day Hypothesis table is the existing seed).
- The magic-failure motif: the Alphatian Day When Magic Fails (Amphimir 28) and the Ethengar Stellar Cataclysm both tie a magic-suspension to a celestial anomaly — possibly a shared Nithian astrological inheritance worth its own note.
- The 12-year animal cycle vs the Glantrian horoscope: two zodiacs, one keyed to birth-year, one to birth-month/week — a comparative astrology note.
VIII. The corpus #
Canon-transcribed calendars: Calendar, Thyatis · Calendar, Alphatia · Calendar, Glantri · Calendar, Rockhome · Calendar, Darokin · Calendar, Karameikos · Calendar, Minrothad · Calendar, Ylaruam · Calendar, Ierendi · Calendar, Five Shires · Calendar, Ethengar · Calendar, Shadow Elves · Calendar, Elven Known World · Calendar, Elven Starmap · Calendar, Milenian
Constructed (thesis-applied): Calendar, Northern Reaches
Research frameworks: Calendar, 372-Day Hypothesis
Companion language notes: Language, Rockhome Dwarven · Language, Hin Five Shires
One line The Nithians built the clock that everyone else still runs on — even after the Spell of Oblivion tried to erase them from history.
