Hevel's halo

{
  "id": "MLC-T-MET-006235",
  "term": "Hevel's halo",
  "field": "Meteorology and atmospheric science",
  "definition": "A rare atmospheric optical phenomenon, also known as a 23-degree halo, that appears as a faint, circular ring of light around the sun or moon. It is caused by the refraction of sunlight or moonlight through hexagonal ice crystals in the atmosphere, specifically those with a particular orientation. This halo is less common and typically fainter than the more frequently observed 22-degree halo.",
  "url": "https://mlchart.com/terminology/meteorology/hevel-s-halo/"
}