The Ymirean heavens gyre not only with sun and moons, but also with multitudes of stars. In the main, their light is white, but some glow blue, purple, red, orange, yellow or green.
Astrologers have divided the stars into five classes:
These stars have permanents abodes in the heavens, such as the Twin North Stars, which sits "underneath Boreas's brow" and are also known as "Aule's Eyes". Fixed stars are a great boon to navigation.
These stars circle the world's disk in a rightwise fashion. The ten star signs are all constellations of dexter stars.
Circle the world's disk widdershins.
Vagabonds may gyre rightwise or widdershins, and a few reverse their direction regularly or irregularly, most notorious of these is the Twinkler.
The ephemera constitute shooting stars, comets, and other irregularities.