Flayer Reckoning and the Silver Year
When the Silver Sisters were ready to activate the Transoptical Flayers for the very first time, they knew it meant a new era for the entire species, and it seemed only natural to begin a fresh reckoning of time from that point. A debate ensued as to when exactly to perform the Activation of the Flayers. There were two major factors: the scientific and the political. The initial activation required the use of the sun as an energy source. Experts advised that the perihelion of the Silver-Morgan barymeter (that is, the moment at which the planet and moon pair were closest to the sun that year) was the most opportune occasion. Councilors, on the other hand, argued that the date should be an already memorable one, to piggy-back on its glory as well as to provide for continuity in the minds of the populace. The day of the Vernal Equinox (in Horgothic: sarrima nu paidun, or Northstand) was finally chosen, as it was a major festival in the northern regions whose powers were ascendant at the time, and it happened to fall just nine days before perihelion (more exactly: 8.7892121083 days). The timing was grudgingly deemed acceptable by the scientists.
And so the flayers were activated at the start, which is to say, at sunrise, of that day. Northstand actually happened around one-fifth of the way into that first day. Now, there are roughly 317 Silver days (a day being defined as a synodic rotation) in a Silver year. More precisely, the tropical year (from Northstand to Northstand) is close to 317.016264669013 Silver days long, the anomalistic year (from perihelion of the barymeter to perihelion) is 1.0000179157 times the tropical year, and the sidereal year (revolution around the sun) is 1.0000206973 times the tropical year. Rather than revisiting the nightmarish intercalary mechanisms of the past, the Sisters decided to simply use a notional calendar of 317 days. Over two millennia into the space age by that point, they had no trouble with tracking the various celestial phenomena as they drifted along their eminently practical calendar.
The year is divided into five months with very traditional names: Banuibel, Tarteika, Tolmarika, Zishgerion and Varabel. All but Tolmarika are composed of 11 six-day weeks. This last has only 9 weeks, and the last week is only five days long. Northstand, occurring on the first day of the year when the Flayer Reckoning begun, moves forward at the rate of one day every 60 years. As of F.R. 8842, it takes place in the third week of Tolmarika. Your average-lived Silver Incula will probably see the seasons shift around one week in her own lifetime.
Finally, it must be kept in mind that the Silver day is longer than an Earth day, roughly 1.16423746224 in fact. Thus the Incudean year is about 369 Earth days long.