The sun […] was helped at sunrise and sunset by divine twins in the shape of warriors, riders, horses, or horned animals. […] At its zenith, the sun passed through the sky, where the sky god Týr ensured cosmic order. He did this by sacrificing his hand in the mouth of a chained wolf, which would otherwise devour the sun. The cosmic order was also secured by the thunder god [Þórr], who fought the powers of chaos in the sky and the world serpent in the sea around the world. During the night, the sun travelled in a night-ship in the underworld.
— Anders Andrén, Tracing Old Norse Cosmology (pg 157), on the reconstruction of the early Gotlandic solar cycle