Trying to calculate the distance between two coordinates

CoordDistance.java

public class CoordDistance {
	
	public static void main(String[] args) {
		System.out.println("Results:");
		
		System.out.println(distance(32.9697, -96.80322, 32.9697, -94.80323, Unit.METERS) + " Meters\n");
	}
	
	/**
	 * Calculates distance between coordinates
	 * 
	 * @param lat1 - First Latitude
	 * @param lon1 - First Longitude
	 * @param lat2 - Second Latitude
	 * @param lon2 - Second Longitude
	 * @param unit - Unit to consider
	 * 
	 * @return Distance in specified {@link Unit}
	 */
	private static double distance(double lat1, double lon1, double lat2, double lon2, Unit unit) {
      double delta = lon1 - lon2;
      double sin = (Math.sin(calcRadians(lat1)) * Math.sin(calcRadians(lat2)));
      double cos = (Math.cos(calcRadians(lat1)) * Math.cos(calcRadians(lat2)) * Math.cos(calcRadians(delta)));
      
      double distance = calcDegrees(Math.acos(sin + cos)) * 60 * 1.1515;
      
      return unit.apply(distance);
    }

    /**
     * Converts decimal degrees to radians
     * @param degrees
     * @return radians
     */
    private static double calcRadians(double degrees) {
      return (degrees * Math.PI / 180.0);
    }

    /**
     * Converts radians to decimal degrees
     * @param radians
     * @return decimal degrees
     */
    private static double calcDegrees(double radians) {
      return (radians * 180.0 / Math.PI);
    }
    
    private static enum Unit { 
    	MILES(dist -> dist), 
    	
    	KILOMETERS(dist -> dist * 1.609344),
    	
    	METERS(dist -> KILOMETERS.apply(dist) * 1000)
    	
    	;
    	
    	private final Function<Double, Double> function;
    	private Unit(Function<Double, Double> function) {
			this.function = function;
		}
    	
    	public Double apply(Double millesDist) {
    		return this.function.apply(millesDist);
    	}
    	
    }

}