Terrestrial refraction

{
  "id": "MLC-T-MET-009561",
  "term": "Terrestrial refraction",
  "field": "Meteorology and atmospheric science",
  "definition": "The bending of light rays that travel between points on or near the Earth's surface, such as from a distant hill or ship to an observer, caused by the vertical density gradient of the lower air. It makes distant objects look higher or lower than they are, and surveyors correct for it with a refraction coefficient of about 0.13. It differs from astronomical refraction, which affects rays entering the atmosphere from space.",
  "url": "https://mlchart.com/terminology/meteorology/terrestrial-refraction/"
}