The Crepusculan homeworld was an inhabited planet in the Alpha or Beta Quadrant. It was home to the Crepusculans, who had been living there for over a thousand years. Starfleet considered the planet subject to General Order One.
The planet featured sandy deserts with numerous rocky outcroppings. One such desert region contained a Crepusculan village with nearby water well and a canyon in which containing their egg sacs. Weather included surprisingly fast-moving thunderstorms capable of disrupting communications. Visiting Humans might sport specialized desert-adapted uniforms, and sunglasses. At least two celestial bodies were visible in its yellow sky.
In 2256, the planet's inhabitants faced imminent extinction after ambient radiation from a nearby meteor drilling accident dried out the water table. Captain Philippa Georgiou and Commander Michael Burnham of the USS Shenzhou visited the planet in order to remedy the situation. Using a map, they located a well and drilled through the bedrock, releasing large amounts of water. They had hoped to do this covertly, but unbeknownst to them they were observed by several Crepusculans.