Aetherian timekeeping.
Time doesn't exist in the normal way it does elsewhere, in the laws of the Aether, time happens in a different manner, and occurs in units exactly of five and ten, below is the units used to keep track of where in the current orba, or year, that you're in.
An orba, or year, is made up of ten nyre (months), each corresponding to an element to which it is ruled by, and governs it's version of seasonal weather. Each nyre, can then be further broken down into ten oagi (weeks), each oagi is then consisted of five ruik (days), each day has two phases, or siruik (subdays), TarkSiruik is the light subday, the version of morning and afternoon in a day, and TalSiruik is the dark subday, the version of evening and night. So in every orba, there are approximately five hundred ruik, one thousand siruik, one hundred oagi, and ten nyre, for each universal solar cycle, this is multiplied by five.
The cycle of the ten nyre occur as such, and reflects the "seasons" of the Aether: Ruaninyre, Xyrinyre, Aerinyre, Icilinyre, Irrinyre, Sorlinyre, Syntinyre, Merlinyre, Forinyre, and Kanzinyre.
Each ruik of the oagi also has a name too! they follow from the first ruik to the last as: Tiruik, sukoruik, daruik, hinruik, and katiruik.
And a little bit of history too...
: Before the event known as the "cataclysm" was the yarga (royal) era otherwise known as Y.E. this was back when the royal families and the royal islands existed, afterwards when the islands were destroyed and such, the rebuild of Aetherian civilization became known as the hynne (recovery) era, otherwise known as H.E.