Great Desync of Tower Year 12,422

The Great Desync of Tower Year 12,422 was a thirteen-day divergence between the recorded time of the Tower and the time observed by its clocks, its bells, and — in the assessment of the Office of Sequenced Hours — a majority of its inhabitants. It is chiefly remembered not for the divergence itself, which was comparatively brief, but for the formal crystallisation of the concept of Temporal Dissonance that followed it, and for the recensions of Concordance 12,422-A which have governed the Tower's handling of desynchronised intervals ever since.

Onset and observation

The desync was first noted on the eleventh of Second Bell, when the sextons of Floor 3409 rang the noon office seven minutes and forty seconds before the meridian shadow reached the gnomon of the Lesser Meridian of the North Shaft. The discrepancy was entered in the floor log as a clerical error. By the third day the leading Interval had widened to four hours, and floors in the same shaft were keeping incompatible afternoons.

The Office of Sequenced Hours dispatched three auditors along the North Shaft. Their report, filed as Annex 11 to the Sequenced Hours, records that at the fourth landing they encountered a corridor in which the same bell sounded twice with no interval between, and that one auditor — Auditor Selem Vey, whose account is the fullest we possess — sustained a private lag of some eighteen minutes for the remainder of the expedition, arriving at meals before they were laid and leaving after the second course had been cleared.

"I have synchronised my watch to the wall clock. The wall clock has not synchronised to anything I can identify. I am keeping my watch."

— Auditor Selem Vey, Field Note 4, Annex 11 to the Sequenced Hours

The peak of divergence

Between the fifth and ninth days the tower's internal offsets peaked. The Chronometric Archive of Floor 1150 recorded a maximum divergence of nineteen days, six hours and fifty-one minutes at the Aperture delta of the Great Vertical Spiral, where the archive's four independent water clocks agreed with each other and with nothing else in the Tower. The Great Chronometer is reported to have registered the anomaly without ceasing its count, though its caretakers have never agreed on what it registered, and its daily readings for the period were later struck from the public register by order of the Keeper.

Routine administration did not stop. The Registry of Overdue Returns processed 41,000 items in the thirteen days, of which some 6,300 were logged as returned before they had been borrowed. The Registry has declined to correct these entries, holding that they were accurate at the time of filing.

The Crystallisation of Temporal Dissonance

The Great Desync is credited in nearly all standard recensions with crystallising the formal concept of Temporal Dissonance — the definition of a desynchronised state as a documentable condition of the Tower, distinct from simple error and to be described in its own vocabulary rather than corrected. Before 12,422 the word appears only twice in the record, both times in a marginal gloss on Concordance 9,117 that later collators have read as a copyist's addition. The Glossarists' Chapter of Floor 62 completed the formal definition within a decade of the event, and the term was embedded in the register of Floor 2008 by Tower Year 12,431.

Scholarship disputes the direction of causation. The first recension of the settlement documents describes an emergent dissonance arising spontaneously in a shaft otherwise in good repair; the second recension, which superseded it in Tower Year 12,428, attributes the whole episode to a failure in the calibration of the Meridian Standard following routine servicing in the previous year. The third recension states the question is owed to neither office and declines to answer it.

Resolution and the position of the Concordance

The desync ended without ceremony on the thirteenth day, when the offsets closed of their own accord. The Committee of the Settled Hour received the closure as a reportable event, established the Register of Constant Remembrance of the Desync to record affected intervals on Floor 4412 and its dependents, and prescribed that any future offset exceeding six minutes be referred to it at once. A visiting rule attached to the register requires that any reader consulting it must leave the reading room at the hour shown on their own device, irrespective of any bell. The rule has been observed.

Concordance 12,422-C, still in force, permits the citation of a desynchronised hour in any administrative dispute provided the party citing it also cites the hour it was desynchronised from. In practice this has served to settle more disputes than it was written to settle, and the Court of the Settled Hour has remarked in Ruling 77 that parties frequently cite both hours without consulting either.

Disagreements in the record

Two matters remain unsettled. The duration of the desync is given as thirteen days in the Office of Sequenced Hours and as twelve days and twenty-three hours in the register of Floor 4412; the later recension notes that both counts were taken from the same bell and offers no reconciliation. Separately, the Index of the Metaphysical records the Great Desync as an instance of the "irreconcilable interval" category; the Glossarists' Chapter, in an appendix published in Tower Year 13,914, rejects the classification as an overreach, observing tartly that an interval is only irreconcilable until someone reconciles it. The two entries have not been harmonised, and no office has been directed to harmonise them.

No one was punished for the Great Desync, though Auditor Selem Vey was twice reprimanded for arriving early.