How to calculate the distance between a given place and others around it

// updates the Deal table

let tDeals = base.getTable(‘Deals’);

let qDeals = await tDeals.selectRecordsAsync();

for (let rDeals of qDeals.records){

let d= getDistanceFromLatLonInKm(rDeals.getCellValue(‘Latitide’),rDeals.getCellValue(‘Longitude’),rDeals.getCellValue(‘BLa’),rDeals.getCellValue(‘BLong’));

await tDeals.updateRecordAsync(rDeals.id, {‘Distance’ : d})

}

// distance between 2 given points (in miles)

function getDistanceFromLatLonInKm(lat1,lon1,lat2,lon2) {

var R = 3958.75586579; // Radius of the earth in miles

var dLat = deg2rad(lat2-lat1); // deg2rad below

var dLon = deg2rad(lon2-lon1);

var a =

Math.sin(dLat/2) * Math.sin(dLat/2) +

Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * 

Math.sin(dLon/2) * Math.sin(dLon/2)

; 

var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));

var d = R * c; // Distance in miles

return d;

}

function deg2rad(deg) {

return deg * (Math.PI/180)

}