Oddly, despite materials (such as the Dragonlover's Guide to Pern stating Long Intervals were four hundred and fifty years in length, characters still referred to the Second Long Interval as being four hundred years in length as late as All the Weyrs of Pern.While this is of course the result of a retcon, it could also be explained along with the ot This timeline gives the dates as they were reco.As time went on, Pernese archivists began recording the years by counting how many years had passed since the Pass or Interval began, which resulted in the "true date" being lost.

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The "true dates" were restored by AIVAS, and the new system dubbed the "AIVAS Adjusted Turn".

This system was inherently flawed, due to the fact that the Red Star's orbit was inconsistent.

As a result of this, the Ninth Pass was listed as having begun on 2508 AL, when in reality it had begun in 2521 AL.

The dates were soon remedied, and the new system dubbed the "AIVAS Adjusted Turn".

It was a luno-solar calendar based both on Coruscant's orbit around its sun, and the orbit of its primary satellite, Centax-1. Sixty standard seconds made up each standard minute, and sixty minutes made up each standard hour. A standard week was 5 standard days, and each month was seven weeks (making 35 standard days each month).

A standard year was 368 days, composed of ten months, three fete weeks, and three holidays.

From that point on, the year in which the Battle of Yavin occurred was the epoch used for the dating system.

The calendar was based on the size and rotation of the planet Coruscant.

In some versions of Moreta: Dragonlady of Pern, an alternate timeline; listing only the dates that each Pass began, is included in the appendices at the back of the book.