The 8-HOUSE™ Calendar is a Southern Hemisphere solar, equinox-anchored, perennial calendar of eight equal Houses across a 360-Roterra living year, with epagomenal Liminal Roterras placed outside ordinary time.
Below is a complete explanation of what it is and how it works.
Calendar Structure
The 8-HOUSE year is built from four nested layers:
8 Houses × 3 Mandels × 3 Quintiles × 5 Roterras = 360 Living Roterras
The living grid is accompanied by two special outside-time periods:
The Liminal = Sep 18–22
Leap Liminal = Feb 29 (in leap years)
Every 8-HOUSE year begins on September 23, making the calendar a fixed perpetual grid.
1 · Houses — the big seasonal chapters
The outer ring is divided into 8 Houses. Each House lasts 45 Roterras. Houses are the main seasonal chapters of the year.
| House | Logo | Name | Meaning |
|---|---|---|---|
| H1 |  | The Quickening | Spring ignition, life returning, first movement. |
| H2 |  | The Surge | Growth, expansion, pressure rising. |
| H3 |  | The Crest | Summer height, abundance, peak force. |
| H4 |  | The Hardening | Heat, endurance, form, consolidation. |
| H5 |  | The Turning | Autumn shift, descent begins, soil and change. |
| H6 |  | The Falling | Cooling, stripping back, surrender, wintering. |
| H7 |  | The Deep | Inner dark, mystery, rest, underworld time. |
| H8 |  | The Dreaming | Imagination before spring, seed-before-seed. |
2 · Mandels — the 15-Roterra light phases
Each House contains 3 Mandels. Each Mandel lasts 15 Roterras.
Mandel is the Czech word for a counted group of 15 — historically used in agricultural contexts for bundling specific items. The number fits exactly: 15 Roterras, 3 Mandels per House.
| Mandel | Logo | Name | Meaning |
|---|---|---|---|
| 1 |  | Lumen | First light, beginning, emergence. |
| 2 |  | Radiance | Active brightness, force moving outward. |
| 3 |  | Brilliance | Peak expression, clarity, result. |
Lumen → Radiance → Brilliance
3 · Quintiles — the 5-Roterra weeks
Each Mandel contains 3 Quintiles. Each Quintile lasts 5 Roterras. These are the closest equivalent to weeks.
| Quintile | Logo | Name | Meaning |
|---|---|---|---|
| 1 |  | Ignite | Begin, activate, set the spark. |
| 2 |  | Ascend | Build, climb, strengthen. |
| 3 |  | Crown | Complete, reveal, bring to form. |
Ignite → Ascend → Crown
4 · Roterras — the 5-Roterra repeating cycle
Each Quintile contains 5 named Roterras. This cycle repeats through the whole 360-Roterra living year.
| Roterra | Logo | Name | Meaning |
|---|---|---|---|
| 1 |  | Spark | Start, decide, initiate. |
| 2 |  | Anchor | Ground, stabilise, prepare. |
| 3 |  | Forge | Build, repair, labour, make. |
| 4 |  | Beacon | Signal, share, communicate. |
| 5 |  | Seal | Finish, close, commit, mark complete. |
Spark → Anchor → Forge → Beacon → Seal
5 · Date Notation
The date notation uses four numbers:
House.Mandel.Quintile.Roterra
Example: 6.1.2.4
| Position | Value | Meaning |
|---|---|---|
| 6 | House 6 | The Falling |
| 1 | Mandel 1 | Lumen |
| 2 | Quintile 2 | Ascend |
| 4 | Roterra 4 | Beacon |
6.1.2.4 = The Falling · Lumen · Ascend · Beacon
6 · Years — Zero, z-years, and the Roman count
8-HOUSE years use a special origin point. The year 2000 is the first year, written as Year Zero. The normal Roman count begins after that.
2000 = Year Zero
2001 onward = Year + Roman numeral
Before 2000 = Year z + Roman numeral
The z prefix marks years before Zero, using the same Roman numerals. For example, 1999 is Year z I (short form zI), because it is one year before Year Zero.
Because the 8-HOUSE Calendar year begins on September 23, the year label follows the cycle that begins on that date. For example, the cycle from Sep 23, 2025 through the end of its Liminal period is Year XXV. Sep 23, 2026 begins Year XXVI.
| Gregorian Year / Cycle Start | 8-HOUSE Year | Rule |
|---|---|---|
| 1997 | Year z III | Three years before Zero |
| 1998 | Year z II | Two years before Zero |
| 1999 | Year z I | One year before Zero |
| 2000 | Year Zero | The zero-point / origin year (first year) |
| 2001 | Year I | First Roman year after Zero |
| 2002 | Year II | Second Roman year after Zero |
| 2025 | Year XXV | Twenty-fifth Roman year after Zero |
| 2026 | Year XXVI | Twenty-sixth Roman year after Zero |
Full notation example:
Year XXV · 6.2.3.2 · 001.29
Short date & time:
1.29-6.2.3.2-XXV
This reads as: the 8-HOUSE year that began in 2025, House 6, Mandel 2, Quintile 3, Roterra 2, at Arc 001, Tik 29 of the current Roterra. In compact Arc.Tik notation, leading zeros may be removed, so 001.29 becomes 1.29.
7 · Arc Time™ — the 360-Arc day
Arc Time is the companion clock system for the 8-HOUSE Calendar. A full 24-hour day is one Roterra, divided into 360 Arcs. Each Arc is exactly 4 minutes, which also means each Arc matches 1 degree of the full daily rotation.
1 Roterra = 360 Arcs = 24 hours
1 Arc = 4 minutes = 1° of the day
1 Arc = 15 Ides = 45 Tiks
Below the Arc sit two finer units, and above it sits the Vector. Three Tiks make one Ide, so every face measures the same instant — just at different resolution.
| Unit | Size | Per Arc | Shown on |
|---|---|---|---|
| Vector | 3 hours (45 Arcs) | — | Analogue ring — the eight Stations |
| Arc | 4 minutes (1°) | 1 | Both faces |
| Ide | 16 seconds | 15 | Analogue fine hand |
| Tik | 5⅓ seconds (approximately 5.33) | 45 (3 per Ide) | Digital — Arc.Tik |
The digital readout shows Arc and Tik, written with a full stop — for example 087.33 (Tik runs 00–44, then rolls to the next Arc). The analogue face shows the Vector Station, the Arc hand, and the Ide hand.
Notation:
Arc 1010°087.33Formal writing uses Arc 10. Short symbolic writing uses 10°. The live clock reads Arc.Tik (e.g. 087.33); a decimal option may be added later.
Arc 000 anchors to midnight (00:00) local time. Each Arc counts forward from there through the Roterra. To convert a clock time, count the completed four-minute Arcs, then express the remainder as Tiks. For example, 14:00:00 = 210.00, 06:28:00 = 097.00, and 06:30:00 = 097.22.
The Eight Stations of Arc Time
Eight fixed points divide the Roterra at 45° intervals. They turn the 24-hour cycle from a passive clock into a working rotation, each Vector and Station marking a shift in the quality of the time. The Station names are symbolic anchors; actual sunrise, solar noon, sunset, and darkness vary by season, location, and daylight-saving time.
| Arc | Clock | Station | Vector | Meaning |
|---|---|---|---|---|
| 000° | 00:00 | Full Dark | The Nadir | The floor of the rotation, given wholly to rest and system restoration — not dead time, but the mechanical prerequisite for everything that follows. |
| 045° | 03:00 | Dawn | Pre-Ignition | The first crack of return. Engines spin up in the dark; a phase of isolation, planning, and quiet calibration before the world asks anything. |
| 090° | 06:00 | Daybreak | The Rubicon | The symbolic horizon is crossed and the line is crossed with it. Focus turns outward; the working day is entered, and there is no stepping back across it. |
| 135° | 09:00 | Highsun | Mid-Azimuth | Full momentum. The open ground of the Roterra, where the real labour is pushed and the most exposed, productive work is done. |
| 180° | 12:00 | Full Light | The Zenith | The midpoint and symbolic apex of solar input. A balancing checkpoint — measure what has actually been made against what the Roterra set out to do. |
| 225° | 15:00 | Longshadow | Consolidation | The light lengthens and tips over. Output begins its descent; the work winds toward conclusion rather than expansion. |
| 270° | 18:00 | Nightfall | The Terminator | The symbolic edge between day and dark. External work terminates; results are gathered and catalogued, and the communal wind-down begins. |
| 315° | 21:00 | The Witching | Orbital Closure | The final dark stretch before the floor. Also known as the last passage. Loose ends are sealed and the day's record is committed before it dissolves back into Full Dark at 000°. |
Arc.Tik conversion example:
001.29 = Arc 001 · Tik 29
One complete Arc contributes 4 minutes. Twenty-nine Tiks contribute approximately 2 minutes and 35 seconds. Therefore, 001.29 is approximately 6 minutes and 35 seconds after midnight local time.
Live Analogue Arc Clock
The analogue face below uses your device’s local time. The Arc hand sweeps continuously through the 24-hour rotation, the longer Ide hand rotates through the fifteen Ides inside each Arc, and the centre square shows the current Tik.
How to read it: the blue hand tracks the current Arc across the full 24-hour dial, the longer coral hand travels through the fifteen Ides of that Arc, and the square counter advances through Tiks 00–44.
8 · The Liminal
The Liminal is not part of the 360-Roterra living year. It sits outside the ordinary grid.
The Liminal = Sep 18–22
These are the 5 year-end reset Roterras. They are useful for review, archiving, cleaning up unfinished work, resetting plans, and preparing for the next year.
9 · Leap Liminal
In leap years, Feb 29 becomes Leap Liminal. It is also outside ordinary time.
Leap Liminal = Feb 29 in leap years
This prevents the calendar from shifting. The living grid stays stable forever.
10 · The Ides
The Ides is a named holiday period distinct from the smaller Arc Time unit called an Ide. The similarity in name is intentional and acceptable, but they refer to different things.
The Ides = Mar 15–19
In the Northern Hemisphere, The Ides is the mid-year spring feast: a five-day festival held inside the ordinary 360-Roterra count, five days before the northern spring equinox.
It is not Liminal time, not outside the calendar, and not a year-reset period. In the Southern Hemisphere, these same Roterras continue as ordinary counted days, though they may still be observed lightly in recognition of the north.
11 · House Colours & Logos Key
| House | Logo | Name | Colour Role | Hex Code |
|---|---|---|---|---|
| H1 | | The Quickening | Emerald | #288b39 |
| H2 | | The Surge | Yellow | #ffea00 |
| H3 | | The Crest | Orange | #FF7722 |
| H4 | | The Hardening | Red | #B83232 |
| H5 | | The Turning | Brown | #8B5E3C |
| H6 | | The Falling | Ultramarine | #1e34a2 |
| H7 | | The Deep | Royal Purple | #5D22AC |
| H8 | | The Dreaming | Periwinkle | #8EA7E9 |
12 · Practical Use
| Unit | Use it for |
|---|---|
| House | 45-Roterra seasonal goals. |
| Mandel | 15-Roterra project phase. |
| Quintile | 5-Roterra work cycle. |
| Roterra | Daily mode or focus. |
| Liminal | Reset, review, and prepare. |
Quick reference:
House = 45-Roterra seasonal chapter
Mandel = 15-Roterra phase
Quintile = 5-Roterra week equivalent
Roterra = 24-hour day/night cycle
Liminal = outside-time calibration
Complete Colour Legend
Houses
Mandels
Quintiles
Roterras
Liminal
