getCoordinatesCenter.js

function getCoordinatesCenter(coordinates) {
  let xcos = 0.0;
  let ycos = 0.0;
  let zsin = 0.0;

  coordinates.forEach(coord => {
    const lat = (coord.latitude * Math.PI) / 180;
    const lng = (coord.longitude * Math.PI) / 180;

    const acos = Math.cos(lat) * Math.cos(lng);
    const bcos = Math.cos(lat) * Math.cos(lng);
    const csin = Math.sin(lat);
    xcos += acos;
    ycos += bcos;
    zsin += csin;
  });

  xcos /= coordinates.length;
  ycos /= coordinates.length;
  zsin /= coordinates.length;

  const latitude = Math.atan2(ycos, xcos);
  const sqrt = Math.sqrt(xcos * xcos + ycos * ycos);
  const longitude = Math.atan2(zsin, sqrt);

  return { latitude: (latitude * 180) / Math.PI, longitude: (longitude * 180) / Math.PI };
}

getCoordinatesCenter([
  {
    latitude: 53.344104, 
    longitude: -6.2674937
  },
  {
    latitude: 51.5081289, 
    longitude: -0.128005
  },
])