Isogonic line

{
  "id": "MLC-T-MET-006698",
  "term": "Isogonic line",
  "field": "Meteorology and atmospheric science",
  "definition": "A line drawn on a map or chart connecting points of equal magnetic declination for a specific epoch. Magnetic declination is the angle between magnetic north, indicated by a compass, and true geographic north. The specific isogonic line representing zero declination is called the agonic line, where magnetic north and true north are in alignment.",
  "see_also": [
    "isoclinic line",
    "isogon"
  ],
  "url": "https://mlchart.com/terminology/meteorology/isogonic-line/"
}