The world of Tersa is not well understood by many of its inhabitants, but scholars largely agree that Tersa is a sphere, orbited consistently by a single moon. While there is some disagreement regarding whether Tersa orbits its sun, or whether the sun orbits Tersa, the planet is known to experience 24-hour days, due to its steady rotation.
The heavenly bodies seen in Tersa’s night sky are known to change, albeit with no predictability or regularity. Typically this results in the appearance of new stars and constellations, and the disappearance of familiar stars and constellations, but on rare occurrences, Tersa has been known to be host to visiting moons, though their stays are always brief. Though no one can recall any changes in the position of Tersa’s sun, tales about such events are widely popular with bards and entertainers.