There are two moons in the skies, known as The Twin Sisters, or The Twins.
- Moves East-to-West
- Trying to catch up with the sun and has a full moon more frequently
- The Defiant
- Moves West-to-East
They meet at the top of the sky as new moons at about the middle of the season. This is known as the Twin’s Kiss. Many rhymes exist about the luck of this day.
As time passes there is the Twin’s embrace, as they move towards each others, followed by the Fighting Twins, as they darken and move away from each other.
The Idhrinn Calendar is a seasonal calendar, and thus has variable length months.
Each season lasts approximately 80 days. Each season is split into two months or moons.
The change of seasons is indicated by an event, which may vary slightly.
The official change of the seasons is marked by the Avowed Watchers with a public signal. A group of scholars, who track the world and gather knowledge. Made up of monks and druids, there are several fortress-libraries scattered throughout the lands, each tasked with a season. The Avowed Watchers also maintain many smaller outposts. Each public signal is often accompanied by a young monk, proclaiming the season to nearby communities and sending a raven to all the nearby Raven Masters.
- Event: The first Spring Orchid blooms in the Year’s Garden
- Public Signal: Release of hundreds of butterflies
- Event: Shift in the prevailing winds
- Public Signal: The pouring of water from the outposts
- Event: Leaves change colour in Chauntea’s Orchard
- Public Signal: A large blue-green flame lights the top of the outposts along with blue-green torches carried into towns. These are meant to symbolize the spirits of the dead, a reminder that the death of the year is coming.
- Event: First snowfall in the lowlands
- Public Signal: The release of the white ravens.
The 80 days is consistent enough however that all written calendars stick with it. Any extra days beyond the expected are known as “Days of the Feywild” (or Feywild Days), which do not officially belong to a month and are often used as a holiday. In the event a season is longer, most written calendars have a box at the end of the season to mark the Days of the Feywild.