{
 "id": "source/tekeli-trigonometry-1986",
 "class": "source",
 "slug": "tekeli-trigonometry-1986",
 "label": {
  "ar": "المثلثات في القرن السادس عشر — تكلي1986",
  "en": "Sixteenth-century trigonometry — Tekeli1986",
  "ur": "سولہویں صدی کی مثلثیات — تکیلی1986"
 },
 "summary": {
  "ar": "دراسة مقارنة للسدرة وكوبرنيكوس؛ قرئت مواضع محددة، وليست نشراً لجداول الجريدة العشرية.",
  "en": "Comparison of Sidra and Copernicus, read selectively; not an edition of the Jarida's decimal tables.",
  "ur": "سدرہ اور کوپرنیکس کا منتخب پڑھا گیا تقابل؛ جریدہ کے اعشاری جدول کی تدوین نہیں۔"
 },
 "stub": false,
 "wings": [],
 "regions": [],
 "periods": [],
 "tags": [],
 "aliases": [],
 "themes": [],
 "data": {
  "kind": "secondary",
  "type": "article",
  "title": "Trigonometry in the Sixteenth Century: Copernicus and Taqi al din",
  "author": [
   {
    "family": "Tekeli",
    "given": "Sevim"
   }
  ],
  "issued": {
   "date-parts": [
    [
     1986
    ]
   ]
  },
  "publisher": "Erdem2(4),1986,pp247–272; English article",
  "language": "en",
  "URL": "https://dergipark.org.tr/en/pub/erdem/article/553170",
  "open_access": true,
  "reliability_note": "Actual article PDF downloaded outside git and selected pp247–250,257–258,269–272 read; not all26 pages. Text compares Copernicus and Sidrat muntaha, documents Sidra diameter120/radius60 and sine/half-chord definitions. It is not primary evidence of Jarida's decimal digits, radius or grid. Older Egypt-birth/1575-observatory statements differ from later authored BEA/TDV; not adopted as settled biography. Extracted OCR has obvious errors, including shadow formula typography; no inaccurate formula copied into museum calculations. Metadata247–272 is the English article;219–246 is separate Turkish version.",
  "sources": [
   "source/tdv-takiyyuddin-er-rasid"
  ],
  "status": {
   "review": "published",
   "completeness": 3,
   "generated_by": "Copilot SDK in VS Code"
  },
  "provenance": {
   "layer": "own-research",
   "generated_by": "Copilot SDK in VS Code",
   "model": "unknown",
   "run": "inventions-p3-b55",
   "source": "Actual journal metadata and explicitly selected full-text pages; downloaded PDF/OCR outside git."
  }
 },
 "prose": {},
 "degree": 0,
 "contemporaries": [],
 "updated": "2026-11-06",
 "connections": [],
 "related": [],
 "license": {
  "prose": "CC BY-SA 4.0",
  "data": "CC0 1.0"
 }
}