Planetary calendar room

This impressive machine was built by Wan Shi Tong and his seekers using phosphorescent crystals, jade, brass, and other fine materials. Though it may seem like advanced technology, the planetary calendar works on gears and cogs like a watch. The ceiling is domed, like that of a planetarium, with "stars" projected from a crystal. The room uses its crystal-made stars, along with several rotating planets, to act as a kind of almanac showing both recorded history and projected future planetary alignments. Aang and Sokka used the room to search information about the eclipse.