Omega sun

{
  "id": "MLC-T-MET-007684",
  "term": "Omega sun",
  "field": "Meteorology and atmospheric science",
  "definition": "A sunrise or sunset appearance in which a mirage distorts the Sun's lower edge so that the outline resembles the Greek letter omega, with the disk joined to a flattened base. It results from refraction in a shallow layer of air near the horizon with a strong vertical temperature gradient, and it is classed as an inferior mirage.",
  "url": "https://mlchart.com/terminology/meteorology/omega-sun/"
}