Era beginning/end
The Concept of Time is Realised and Sparks a New Age
During the events of the Year 0 which is what it is know as after the Realisation, the people within Suni Zemik find out the passage of time with the shadows moving around the trees perfectly, so during the year 0 and 1 the mathematicians of the tribe figure out how much time has passed and how they will calculate time passage in the future, during the Year 1 they also make the first Calendar also known in Zurun as Sunvuhrem