Tiānguāng

Tiānguāng or the Great Skyflame, is the fire body which provides a day/night cycle to the demiplane of Lamasery. It takes the visible form of a giant, two-sided disc of flame which slowly rotates in the sky above Lamasery in a regular pattern.

Daily Rotation
The blazing golden side of Tiānguāng's disc shines throughout the day, slowly ebbing in heat and intensity as more and more of the silver side is revealed. Once this process completes, over a period of twelve hours, day becomes night. While the light provided by the silver side of the disc is significantly cooler, it retains almost the full intensity of its obverse side.

Months and Seasons
The disc of Tiānguāng also maintains a monthly cycle, slowly drifting above the bowl of the demiplane at a consistent rate. This takes the form of a slow right-hand procession (when observed from the surface of Lamasery) around the edge of the demiplane. As this procession continues, each Corner of Lamasery receives the attentions of Tiānguāng individually, providing a seasonal cycle. It additionally bears mention that even these cycles within cycles seem to contain one final layer, as the disc also seems rises and falls in the sky in such a manner as to be very distant during its zenith in the west and very near during its nadir in the east.