code: function (date) {
                  if (date instanceof Date === false) {
                      throw new ArgumentError(
                          Logger.logMessage(Logger.LEVEL_SEVERE, "SunPosition", "getAsCelestialLocation",
                              "missingDate"));
                  }
  
                  var julianDate = this.computeJulianDate(date);
  
                  //number of days (positive or negative) since Greenwich noon, Terrestrial Time, on 1 January 2000 (J2000.0)
                  var numDays = julianDate - 2451545;
  
                  var meanLongitude = WWMath.normalizeAngle360(280.460 + 0.9856474 * numDays);
  
                  var meanAnomaly = WWMath.normalizeAngle360(357.528 + 0.9856003 * numDays) * Angle.DEGREES_TO_RADIANS;
  
                  var eclipticLongitude = meanLongitude + 1.915 * Math.sin(meanAnomaly) + 0.02 * Math.sin(2 * meanAnomaly);
                  var eclipticLongitudeRad = eclipticLongitude * Angle.DEGREES_TO_RADIANS;
  
                  var obliquityOfTheEcliptic = (23.439 - 0.0000004 * numDays) * Angle.DEGREES_TO_RADIANS;
  
                  var declination = Math.asin(Math.sin(obliquityOfTheEcliptic) * Math.sin(eclipticLongitudeRad)) *
                      Angle.RADIANS_TO_DEGREES;
  
                  var rightAscension = Math.atan(Math.cos(obliquityOfTheEcliptic) * Math.tan(eclipticLongitudeRad)) *
                      Angle.RADIANS_TO_DEGREES;
  
                  //compensate for atan result
                  if (eclipticLongitude >= 90 && eclipticLongitude < 270) {
                      rightAscension += 180;
                  }
                  rightAscension = WWMath.normalizeAngle360(rightAscension);
  
                  return {
                      declination: declination,
                      rightAscension: rightAscension
                  };
              }
docs: Computes the celestial location of the sun for a given julianDate
  @param {Date} date
  @throws {ArgumentError} if the date is missing
  @return {{declination: Number, rightAscension: Number}} the celestial location