Focus is a star, too
From Newman's Dale, Yih's ring is only visible as a thin line stretching from east to west across the sky. As yinrih began following the Bright Way out into the southern grasslands, the ring appeared to widen, dominating the northern sky as the pilgrims approached the mid-latitudes. This celestial prodigy made Wayfarers even more curious about the world above them.
They had already deduced that Focus was a star thanks to the Great Commandment. In particular, males coming home from their nightly hunts noted that the home hearth appeared dim, cold, and small from a distance, but grew brighter, larger, and hotter as they approached. And so it was, they reasoned, with these celestial hearths, dim and cold at a distance, but blazing bright to the star folk who lived up close.
It was the ring that provided Wayfarers their next scientific discovery, the fact that Yih is round. They noticed a curved shadow creeping across the ring on summer nights, and by comparing the phenomenon to the shadows of stones moving across the ground as Focus traveled through the daytime sky, they realized that the body they lived on was a sphere.