Why Two Hundred

Circulated for comment, not for citation. Written because the question reaches this desk about once a season, usually from someone who has just converted a date and wants the arithmetic to mean something. It does not have to. This paper says what each answer in circulation has survived, using the genera of Standing Claims.

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Two things are settled before any account begins, and nothing below unsettles them.

The first is the rule. A UCSD year is the common-era year plus two hundred, every year, every day of it, with no table and no drift in the number. The standard was declared with the Concord under the Tycho Accords of 2343 CE, which it calls 2543 UCSD, and applied backwards to every year before that (Count and Calibration).

The second is the refusal. The count's zero is given no meaning. The standard commemorates no founding, and the record says why: a spine that honoured an event would belong to whoever owned the event. Whatever the two hundred is, it is not a birthday.

That leaves a smaller question than the one people usually ask. Not what does the zero mean, which is answered, but why renumber at all, and why by that much. The Archive holds the Accords and the standard they declared. It holds no minute of the drafting commission's reasons for the figure, and I have looked. What follows is graded accordingly.

That the count starts at the United Space Consortium — refuted

The commonest account, and the one this desk corrects in print most often. The USC was founded in about 2140 CE, which is about 2340 UCSD, and a reader who sees 2340 beside the Consortium and 2343 beside the Accords concludes that the Concord's count was reset to the old institution's founding. It was not. A count that began at the USC would put the USC near its zero, not at 2340, and every common-era date before the Consortium would have needed a new number rather than the same number plus two hundred. The figures sit close together by an accident of spacing: the Accords came almost exactly two centuries after the Consortium, so the Consortium's year in the new count lands beside the Accords' year in the old one. Neither was measured from the other.

The claim was named, tried against the rule, and did not survive. That is the only verdict on this list.

That the two hundred measures the Fragmentation — sole

The folk account, and the kinder of the two. The coastal fragmentation of the 2130s and 2140s CE is where the Crisis Centuries cut deepest, and the Tycho Accords came almost exactly two hundred years after its worst decade. So, the story runs, the Concord's count carries the span between the last great loss and the first lasting peace, and every date written in it is a quiet memorial.

The coincidence is real. The arithmetic is checkable and I have checked it. What is not on the shelf is any sign that anyone at Tycho meant it. No document of the commission's names the Fragmentation, and the standard's one stated principle points the other way: a figure chosen to remember an event would be exactly the kind of ownership the standard refused. Nothing has been offered against the reading except that silence, which is why it stands at sole. It stands because nobody has unseated it, which measures who has looked rather than what is true, and I would not cite it.

That it kept two counts from writing the same present — consistent

The clerks' account, and the one I hold, at the grade it has earned.

The standard was not adopted everywhere at once. Communities out of contact kept the common era. The Celtic Union's arks left on it and its clan archives still cite it, and New London prints both. So for a long while two counts were in use at once, and the hazard of two counts is not the conversion. It is the bare year: a four-digit number written without its era, read by someone who assumes the other one.

Two hundred closes that hazard for as long as it matters. On the day of adoption the Concord wrote its present as 2543 and the common-era keepers wrote theirs as 2343. Every year after, the Concord's present was a number the old count would not reach for two centuries. Every year the old count was writing, from 2344 onward, was a number the Concord used only for the past. And the past, by the companion rule this desk still keeps, is written with its common-era year first. A bare year above 2542 could only be the Concord's present. A bare year below it, in a fresh document, could only be the old count's. The window stayed open until the common-era keepers reached 2543 themselves, in 2743 UCSD, and by then the habit it trained was older than anyone keeping records: write the era. This desk still writes it, on every date, before it is asked.

The account fits every date I have converted, explains the size of the figure as well as the fact of it, and needs no meaning in the zero. What it has not done is beat a rival anyone tried, because nobody has tried one in earnest. A larger figure would have bought a longer window at a higher cost in strangeness; a smaller one, a shorter window; and the commission did not leave its reasons where I could find them. So: consistent. It fits; other readings, never tried, might fit as well; and a reader should hold it as the best account in circulation, not as the commission's.

What the desk files

The rule is settled and the zero means nothing. Of the three accounts, one is refuted, one is a coincidence with a story around it, and one is a reason that fits. The reason the commission actually had is a marked absence, in the sense of Marked Absences: the gap is noted, and nothing is invented to fill it.

Comment invited from anyone holding a Tycho commission paper this desk has not seen.