spacetime-daylight/src/sunPosition.js

calculate approximate sunlight times for a given timezone

import sunCalc from 'suncalc'
import spacetimeGeo from 'spacetime-geo'

function toDegree(radians) {
  let pi = Math.PI
  return radians * (180 / pi)
}

const sunPosition = function (s, lat, lng) {
  if (lat === undefined || lng === undefined) {
    let guess = s.point()
    lat = guess.lat
    lng = guess.lng
  }
  if (!lat || !lng) {
    return {}
  }
  s.in = s.in || spacetimeGeo.in //bolt-on the plugin
  s = s.in(lat, lng)
  let d = new Date(s.epoch)
  let res = sunCalc.getPosition(d, lat, lng)
  // return res
  return {
    azimuth: toDegree(res.azimuth),
    altitude: toDegree(res.altitude),
  }
}
export default sunPosition