Lunar distance

{
  "id": "MLC-T-IND-003466",
  "term": "Lunar distance",
  "field": "Industrial and trades",
  "definition": "The angular separation between the Moon and another celestial object, such as the Sun or a specific star. The method of lunar distances was a technique used in celestial navigation to determine longitude at sea before the invention of accurate marine chronometers. By measuring the angle and consulting pre-calculated tables in a nautical almanac, a navigator could find Greenwich Mean Time and thus calculate their longitude.",
  "synonyms": [
    "LD"
  ],
  "subject": "Metrology and inspection",
  "translations": {
    "de": "Monddistanz",
    "es": "distancia lunar",
    "fr": "distance lunaire"
  },
  "url": "https://mlchart.com/terminology/industrial/lunar-distance/"
}