Chen Collection, Upper Volume Radical: Sun (rì) 暈 Kangxi strokes: 13 Page 497, Entry 37 Pronounced yun (falling tone). The light gas surrounding the sun. Explanation of Names (Shiming): A halo (yun) refers to a wrapping or winding. It is gas that wraps and coils around the perimeter of the sun and moon; this phenomenon occurs with both the sun and the moon. Records of the Grand Historian (Shiji), Treatise on the Celestial Offices: When two armies stand in confrontation, a solar halo may appear.