code: double getHighestElevationOfSun(PlainDate date) {
  
          Moment noon = date.get(this.transitAtNoon());
          double jde = JulianDay.getValue(noon, TimeScale.TT);
          double decInRad = Math.toRadians(this.getCalculator().getFeature(jde, DECLINATION));
          double latInRad = Math.toRadians(this.latitude);
          double sinElevation = // Extra term left out => Math.cos(Math.toRadians(trueNoon)) := 1.0 (per definition)
              Math.sin(latInRad) * Math.sin(decInRad) + Math.cos(latInRad) * Math.cos(decInRad); // Meeus (13.6)
          double result = Math.toDegrees(Math.asin(sinElevation));
  
          if (Double.isNaN(result)) {
              throw new UnsupportedOperationException(
                  "Solar declination not supported by: " + this.getCalculator().name());
          }
  
          return result;
  
      }
docs: used in test classes, too