The calendar upon which the passage of time is marked is called the Portal calendar. It's namesake is an ancient portal discovered at Eoshi Ruin in Armor year. How to work the portal and knowledge of its destination is still a mystery to researchers, but the portal's face was quickly identified as a calendar.
Image (above): The signs of the dreamWheel. The sign of Armor is highlighted in yellow. Click to enlarge.
The Portal calendar has been rapidly adopted by dreamling communities across the Wheel, as it matches observations more closely than the previous calendar, Gregor's Orrery, which adequately mimicked the turn of the Wheel in a device with a number of satellites around a central sphere. Other than being overly complicated, Gregor's Orrery requires many more corrections over the course of a turn of the Wheel compared to the Portal calendar. Furthermore, the corrections of the Portal calendar are more regularly timed.
In fact the only correction necessary is the leap sign. This correction is made every turn of the Wheel, so that each denomination of time begins with the lesser denomination of its own sign. For example, Armor day begins at Armor hour (see image). The following hour is that of Tome, then Potion, and so on around the Wheel. The final hour of Armor day is Turret hour. The next day is Tome, so Armor hour is skipped, and Tome day begins at Tome hour. Each temporal denomination (seconds, minutes, hours, days, etc., through lesser turns and greater turns) follows the same rule.
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