Python calculates distance samples based on latitude and longitude _python

Copy Code code as follows:

/**
 * calculates the distance between two points
 * @param _lat1-start latitude
 * @par Am _lon1-start Longitude
 * @param _lat2-end latitude
 * @param _lon2-end longitude
 * @return km (rounded)
 */
public static double getdistance (double _lat1,double _lon1, double _lat2,double _lon2) {
 double LA T1 = (math.pi/180) *_lat1;
 double lat2 = (math.pi/180) *_lat2;

 double lon1 = (math.pi/180) *_lon1;
 double lon2 = (math.pi/180) *_lon2;

 //The earth radius
 double R = 6378.1;

 double D =  Math.acos (Math.sin (LAT1) *math.sin (LAT2) +math.cos (LAT1) *math.cos (LAT2) *math.cos ( Lon2-lon1)) *r;

 return New BigDecimal (d). Setscale (4,BIGDECIMAL.ROUND_HALF_UP). Doublevalue ();
}

public static void Main (string[] args) {
 system.out.println getdistance (45.73990, 126.55893, 45.73876, 126.55037));
}