PEOPLE
5) The Calendar for People
Human Operating Time
Solarian becomes much easier to understand once one distinction is clear: it has two calendars running together.
One belongs to people:
PEOPLE
Operating Day → Week → Minth → Mear
The other belongs to the local world and its orbit:
PLANET
Orbital Month → Orbital Year
This chapter deals only with the first. Its governing principle is:
The mear belongs to operations and people.
Wherever humans eventually live — Mars, Ceres, Ganymede, Titan, an artificial habitat or somewhere considerably stranger — they will still need recurring periods for ordinary life. Schools need terms, organisations need planning cycles, people need anniversaries, governments need budgets and maintenance teams need schedules; the useful duration of those things should not be dictated by how slowly the local world happens to travel around the Sun.
Neptune makes the point efficiently. Its orbital year lasts almost 165 Earth years, which is perfectly respectable astronomy and a fairly hopeless interval for an annual appraisal. Humans therefore need an operating calendar whose basic rhythm remains human-sized.
The mear and the minth
The largest recurring unit in the human side of Solarian is the mear, short for mini-year.
Conceptually, the mear occupies the role that the terrestrial year performs in much of ordinary human life. It provides an approximately annual-scale cycle within which societies and organisations can arrange education, budgets, maintenance, contracts, planning and personal recurrence without requiring that cycle to grow whenever the local orbital year grows.
The word year is reserved for the astronomical orbit. That leaves the human cycle free to travel. A person moving from Mars to Ceres or from Ceres to the Saturnian system may encounter an orbital year that is radically longer, but their basic operating rhythm does not need to expand with it.
Each mear contains twelve smaller operating periods called minths, short for mini-months:
12 minths = 1 mear
A normal minth contains four complete weeks, giving it roughly the human scale currently associated with a terrestrial month without tying it to any particular planet's orbit. The basic structure is therefore:
7 civil days = 1 week
4 weeks = 1 normal minth
12 minths = 1 mear
The twelve recurring minth positions use the structural identifiers:
A · B · C · D · E · F · G · H · I · J · K · L
Those letters are identifiers rather than proposed cultural names. Future societies can call the periods whatever they like while retaining A–L underneath as the common structural reference.
That distinction will recur throughout Solarian.
The civil day
For most settlements, the standard Solarian civil day contains 86,400 SI seconds, divided into the familiar twenty-four hours. The civil day is therefore Earth-duration by default, but it does not have to correspond to the natural rotation of the world underneath the settlement.
That matters because many Solar-System environments provide thoroughly impractical natural days. A moon may take several Earth days to rotate relative to the Sun, an underground settlement may experience no natural daylight at all, while an artificial habitat can create light and darkness by engineering rather than astronomy.
Those environments can manage illumination, shifts and local operational cycles separately. The civil calendar does not need to imitate an inconvenient rotation merely because nature supplied one.
Mars is the deliberate exception. Its solar day, or sol, is only about forty minutes longer than an Earth day and remains a natural human-scale rhythm for life on the surface. Mars therefore uses the local sol as its civil day rather than imposing an 86,400-second substitute.
The architecture above the day remains the same.
The week is the heartbeat
Seven civil days make one week. That is the most stable recurring rhythm in the Solarian human calendar, and the useful mental model is that the week is its heartbeat.
Minths contain complete weeks, mears contain complete minths and hence complete weeks, and Solarian does not place stray civil days outside that sequence merely to make larger units look tidier.
In practical terms:
Solarian never breaks the week. Ever. Anywhere.
The seven-position sequence therefore continues locally without interruption across month, minth, mear and year boundaries. On settlements using the standard 86,400-second day those weeks can also share a common physical cadence; Mars retains the same seven-position structure but builds it from seven slightly longer sols, so its weekly phase gradually drifts relative to standard-day settlements.
That distinction matters later. For now, the important point is simpler: nobody wakes up after New Year to discover that Tuesday has been removed for astronomical housekeeping.
A minth is normally four weeks
Almost every Solarian minth contains four complete weeks. That produces a normal duration of twenty-eight civil days, or twenty-eight sols on Mars, and gives the human calendar its medium-sized operating period. It serves the broad class of purposes for which people currently reach for “a month”: staffing cycles, recurring payments, project plans, operational reviews, school planning and ordinary personal scheduling.
But a minth is not defined as twenty-eight days.
It is defined structurally as one of the twelve positions within a mear. That distinction allows a small number of designated minths to become one week shorter or longer when a local implementation needs to reconcile the human calendar with real orbital astronomy. The detailed rules come later; all that matters here is that the flexibility is tightly controlled and always occurs in complete weeks.
A normal minth therefore contains four weeks. An adjusted minth may contain three or five. The structure remains recognisable even when the realised duration occasionally moves.
A mear is twelve minths, not necessarily forty-eight weeks
If all twelve minths contain their normal four weeks, a mear lasts forty-eight weeks.
That is its normal form.
It is not its definition.
The definition is:
1 mear = 12 minths
If a designated minth is shortened or lengthened by one week, the mear remains a complete mear because all twelve minth positions still exist.
This separation between structure and duration is important. Stable structure makes the calendar learnable and portable; limited variation in duration allows that structure eventually to coexist with astronomical periods that refuse to arrive in convenient whole numbers.
The mear is therefore approximately a 48-week human operating cycle rather than a fixed 48-week block.
Common identifiers, local names
Solarian needs common identifiers because software, contracts, travellers and institutions cannot rely on every settlement independently inventing mutually compatible terminology.
It does not need to decide the poetry.
The structural minths remain A through L underneath whatever names a local society eventually develops. Weekday names can evolve, holidays certainly will, and nothing in the protocol attempts to decide what future Martians or Titanians ought to celebrate.
The principle is:
Common structure; local culture.
This allows dates to remain machine-readable and interpretable across settlements while leaving ordinary language and cultural meaning with the people who actually live there.
The human calendar stops at the mear
Solarian deliberately adds no further universal human hierarchy above or between these units. It does not prescribe common quarters, semesters, half-mears, decades, seasons or fiscal periods. An organisation may divide a mear into four quarters, a school may use three terms and a society may create religious, agricultural or cultural periods of its own.
Twelve minths make those local divisions reasonably convenient because twelve has several useful whole-number factors. But convenience is not a reason to turn every useful grouping into another universal protocol unit.
The common calendar should contain the structures that need to travel between worlds.
Everything else can remain local.
A portable human rhythm
Imagine somebody born on Mars who later works on Ceres and eventually moves to a habitat in the Saturnian system.
The astronomical calendar around them changes dramatically. The local year changes, the meaning and duration of an orbital month changes, while the physical environment may become almost unrecognisable.
The human operating sequence remains familiar:
Week → Minth → Mear
That continuity is the purpose of this side of Solarian. It gives human civilisation a portable operating rhythm without pretending that every world possesses the same astronomy.
The next step is to add the other calendar.
That one belongs to the orbit.