L.Sun.js

L.Sun = L.Popup.extend({  //var

    //myDemoProperty: 42,   

    // A method 
    sunrise: function(latlon) { return sun.sunset(latlon, -1) },
    
    sunset: function(latlon,s) //{ return latlon+"test"; }  //this.myDemoProperty
    
    //function sun(Breite,Laenge,T,s)   //s=1=sunset; s=-1=sunrise
{
  var Breite = latlon.lat, Laenge = latlon.lng, T = new Date(), s = s||1
  var RAD = Math.PI / 180.0, h = -(50.0 / 60.0) * RAD, B = Breite * RAD;
  T = Math.ceil((T - new Date(T.getFullYear(), 0, 1)) / 86400000) //Tag im Jahr
  var DK = 0.4095 * Math.sin(0.016906 * (T - 80.086)) //sonnendeklination(T);
  var Untergang = 12 + s * (12.0 * Math.acos((Math.sin(h) - Math.sin(B) * Math.sin(DK)) / (Math.cos(B) * Math.cos(DK))) / Math.PI) -
    (-0.171 * Math.sin(0.0337 * T + 0.465) - 0.1299 * Math.sin(0.01787 * T - 0.168)) //12+(-)zeitdifferenz(DK) - zeitgleichung(T);
  Untergang = Untergang - Laenge / 15.0 + -new Date().getTimezoneOffset() / 60; //Zone
  Untergang = Math.floor(Untergang) + ":" + ("0" + Math.round(Untergang % 1 * 60)).slice(-2)
  return Untergang
}  
    
});

L.sun = new L.Sun();  //L.terminator = function(options) {return new L.Terminator(options);};  //var