adhan-extended/lib/esm/Qibla.js

High precision Islamic prayer time library (extended)

import Coordinates from './Coordinates';
import { degreesToRadians, radiansToDegrees, unwindAngle } from './MathUtils';
export default function qibla(coordinates) {
  const makkah = new Coordinates(21.4225241, 39.8261818); // Equation from "Spherical Trigonometry For the use of colleges and schools" page 50

  const term1 = Math.sin(degreesToRadians(makkah.longitude) - degreesToRadians(coordinates.longitude));
  const term2 = Math.cos(degreesToRadians(coordinates.latitude)) * Math.tan(degreesToRadians(makkah.latitude));
  const term3 = Math.sin(degreesToRadians(coordinates.latitude)) * Math.cos(degreesToRadians(makkah.longitude) - degreesToRadians(coordinates.longitude));
  const angle = Math.atan2(term1, term2 - term3);
  return unwindAngle(radiansToDegrees(angle));
}
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