JavaScript Challenge- 11

 /*

Write a program to find distance between two places. 

The Latitude and Longitude of two places will be given.

*/


function findDistance(curr_lat, curr_long, dest_lat, dest_long){

       // Current Latitude & Longitude in Radians..

       let lat1_red = curr_lat * (Math.PI/180);

       let long1_red = curr_long * (Math.PI/180);

       // Current Latitude & Longitude in Radians..

       let lat2_red = dest_lat * (Math.PI/180);

       let long2_red = dest_long * (Math.PI/180);

       // Find Distance..

          let dlon = long2_red - long1_red; // Distance bet. two Longitudes..

          let dlat = lat2_red - lat1_red; // Distance between two Latitude..

          let a = Math.pow(Math.sin(dlat/2), 2)

                     + Math.cos(lat1_red) * Math.cos(lat2_red)

                     * Math.pow(Math.sin(dlon/2),2);

          let distance = 2 * Math.asin(Math.sqrt(a));

          // FInd Distance in KM..

          let distance_in_km = 6378 * distance;

       console.log("Distance between two places is : "+distance_in_km);

}

let start_latitude = 22.8384;

let start_logitude = 88.6196;

let destination_latitude = 22.5678;

let destination_logitude = 88.3710;

findDistance(start_latitude, start_logitude, destination_latitude, destination_logitude);

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