Vápnthjófr saga

More facts about Beaivi- Since large parts of sápmi has polar nights, sami myths told that their sun goddess left during winter, and sacrifices were made to her during winter solstice. Sacrifices were also made to her during summer solstice, and the summer sacrifices involved leaf rings, representing the sun.

(Another ritual involved smearing butter on doorposts, since that melts in the sun, but in this universe, eating animalic food would be kinda weird, so whatever)