{
 "id": "source/britannica-islamic-calendar",
 "class": "source",
 "slug": "britannica-islamic-calendar",
 "label": {
  "ar": "بريتانيكا — التقويم الإسلامي",
  "en": "Britannica — Islamic calendar",
  "ur": "بریٹانیکا — اسلامی تقویم"
 },
 "summary": {
  "ar": "عرض للسنة القمرية واعتماد العصر الهجري ومرجعه، مع وصف حساب جدولي لا ينسب كله إلى عمر.",
  "en": "Lunar year, Hijri-era adoption and epoch, with a tabular scheme not assigned wholesale to Umar.",
  "ur": "قمری سال، ہجری سن کا اختیار اور مبدا؛ بیان کردہ جدول پورا عمر سے منسوب نہیں۔"
 },
 "stub": false,
 "wings": [],
 "regions": [],
 "periods": [],
 "tags": [],
 "aliases": [],
 "themes": [],
 "data": {
  "kind": "secondary",
  "type": "web",
  "title": "Islamic calendar",
  "publisher": "Encyclopaedia Britannica",
  "language": "en",
  "URL": "https://www.britannica.com/topic/Islamic-calendar",
  "open_access": true,
  "reliability_note": "Actual article read: adoption639CE, epoch16July622Julian, lunar months and30year tabular description. Do not attribute the entire later arithmetic cycle to Umar or equate it with every observed calendar. Epoch differs by one day from Abdollahy's15July; both readings retained without adjudicating.",
  "status": {
   "review": "published",
   "completeness": 2,
   "generated_by": "Copilot SDK in VS Code"
  },
  "provenance": {
   "generated_by": "Copilot SDK in VS Code",
   "model": "unknown",
   "run": "inventions-p3-b88",
   "source": "Actual article read6November2026; no original decree, modern legal ruling or authoritative universal date converter."
  }
 },
 "prose": {},
 "degree": 0,
 "contemporaries": [],
 "updated": "2026-11-06",
 "connections": [],
 "related": [],
 "license": {
  "prose": "CC BY-SA 4.0",
  "data": "CC0 1.0"
 }
}