Tsarna

Tsarna (/'ʃɑːrnɑː/), more commonly called Earth or Terra by its inhabitants, is the third planet in the Solar System and homeworld of the human race.

Chronology
In approximately 4,549,297,779 BC, a planetary object known as Castis was used as a staging point for the survivors of the Ourean Genocide. Kalea Asima abandoned Razmakan in an area that would later become Durendal, Arveikan. Several million years later, Castis collided with Tsarna, with some of the resulting debris forming a natural satellite in Tsarna's orbit.