Isanthesic line

{
  "id": "MLC-T-MET-006671",
  "term": "Isanthesic line",
  "field": "Meteorology and atmospheric science",
  "definition": "A line on a map connecting locations where a specific phenological event, such as the first flowering of a particular plant species, occurs on the same date. These lines are used in bioclimatology to track the progression of seasons, particularly spring, across a geographical area. The spacing of isanthesic lines indicates the rate at which seasonal conditions are advancing, with closer lines showing a more rapid change.",
  "url": "https://mlchart.com/terminology/meteorology/isanthesic-line/"
}