celestial spheres
in ancient cosmological models, rotating spheres made of aether in which the stars or planets are embedded
en-US/səˈlɛst͡ʃəl ˈsfɪɹz/
en-GB/sɪˈlɛstɪəl sˈfɪəz/
in ancient cosmological models, rotating spheres made of aether in which the stars or planets are embedded