On Aiwerond, a year (pelí) is the time period which passes between two sunsets happening exactly at the same spot at the horizon. The points on the Mirror Line where the sun rises and sets are called east (ums) and west (ongq) accordingly, but their position is changing. They remain, however, always at the antipoles of the Queriwóhri'on. The two of them together are called eleqíra.
The sun, as seen from Aiwerond, is almost stationary in relation to the stars, but the Aiweronian Circle (Aiweroeln) rotates (in anticlockwise sense) and moves. These movements are the cause of the days and nights cycle and the shifting of the eleqíra.
The movement of the sun as observed from Aiwereln always goes in the same direction. A Traveller who moves towards the sun will always have the sun in front of him, even when he crosses the Mirror Line. Despite that the world beyond the Queriwóhrion is reversed, the ongq will remain at the same. (For example, if we set towards a sunset beyond Crackl-Ring-Söz, after crossing the Mirror line, the sun will still be setting beyond the island country.)
There are 360 days in a year, meaning the eleqíra move one degree each day in clockwise direction. That's why the aiweronians use "day" (ens) to measure angles (for example 360e = 360°). The year starts, when, looking from the Sterkil observatory, the sun sets behind Bieneialen, i.e., at the 180e angle point at the Mirror Line. The Sterkil observatory is understandingly a popular destination to celebrate Old and New Year (Tonpelí is Fepelí).
The Year Numbering (Pelmaron) used in most countries starts with Quer I.'s conquista of Awíter. This event is of great national importance for the quertílians, who had been living in the heart of the Zenteníra earlier. They call this earlier period Enon, the Mountain Age. After the Awíter victory, a new age starter - the Ewenon, the Age under the Mountain.
Accordingly, in the Pelmaron, the years before Awíter are called The Years of Enon: Enompelíra. The years after are the Ewenompelíra. They are marked with the letter w (ewenompelíra) and n (enompelíra) after the year number.
The enompelíra are not counted backwards. Instead, old year counting is used, in which the year 3274n = 0w.
The enompelíra era is also called Prequerian and the ewenompelíra Postquerian.