Eilendor celestial objects and wind.

Of Celestial Objects:
The Night Sky: the darkness that the stars rest in is the Great Firmament, that is the roof above the worlds and the bottom of Anruvalir.  The colorful clouds are dust and sparks falling from the halls of the gods above.  Ardin himself divided the worlds, making the Firmament to hold the stars and to help keep the material realms from the divine lights.
Stars: stars are but the legions of the anruvali, keeping watch over the world.  During the day, the anruvali are off, working in Anruvalir, so are not seen during the day, but when Boleras goes to rest and Sileina comes out, the anruvali rest and are seen.
Comets: comets are swiftly moving anruvali, going about their business.  There are three famous comets: Asdorlus the Red Comet, a good omen of victory; Ulsem the Blue Comet, she is seen in the sky wen a hero is born, or a great deed is done; Dirion the Purple Comet, a dire warning of destruction and death, such as the Spellfall, the Fall of the Torand Empire, and the rampage of the Fire Colossus.
Aurora Borealis: are caused by free-floating magic energy in the atmosphere, seen when air conditions are right.  It is seen in the north and the south of Eilendor, the magical currents tend to prefer the two points.  Also this knowledge allowed the dwarf Feldgston to invent, using lodestone, the compass.
Of Wind:
The Four Breaths: the four winds, or breaths, of Eilendor are made by Gentira blowing across the world on her pet eagle.  She flies invisibly through the sky, singing, while her eagle flaps his wings and creates wind currents.