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#### Languages

Sample Codes (Go)
```package main

import (
"fmt"
"math"
)

//:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
//:::                                                                         :::
//:::  This routine calculates the distance between two points (given the     :::
//:::  latitude/longitude of those points). It is being used to calculate     :::
//:::  the distance between two locations using GeoDataSource (TM) prodducts  :::
//:::                                                                         :::
//:::  Definitions:                                                           :::
//:::    South latitudes are negative, east longitudes are positive           :::
//:::                                                                         :::
//:::  Passed to function:                                                    :::
//:::    lat1, lon1 = Latitude and Longitude of point 1 (in decimal degrees)  :::
//:::    lat2, lon2 = Latitude and Longitude of point 2 (in decimal degrees)  :::
//:::    unit = the unit you desire for results                               :::
//:::           where: 'M' is statute miles (default)                         :::
//:::                  'K' is kilometers                                      :::
//:::                  'N' is nautical miles                                  :::
//:::                                                                         :::
//:::  Worldwide cities and other features databases with latitude longitude  :::
//:::  are available at https://www.geodatasource.com                         :::
//:::                                                                         :::
//:::                                                                         :::
//:::  Official Web site: https://www.geodatasource.com                       :::
//:::                                                                         :::
//:::                                                                         :::
//:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

func distance(lat1 float64, lng1 float64, lat2 float64, lng2 float64, unit ...string) float64 {
const PI float64 = 3.141592653589793

radlat1 := float64(PI * lat1 / 180)
radlat2 := float64(PI * lat2 / 180)

theta := float64(lng1 - lng2)
radtheta := float64(PI * theta / 180)

if dist > 1 {
dist = 1
}

dist = math.Acos(dist)
dist = dist * 180 / PI
dist = dist * 60 * 1.1515

if len(unit) > 0 {
if unit[0] == "K" {
dist = dist * 1.609344
} else if unit[0] == "N" {
dist = dist * 0.8684
}
}

return dist
}

func main() {
fmt.Printf("%f Miles\n", distance(32.9697, -96.80322, 29.46786, -98.53506, "M"))
fmt.Printf("%f Kilometers\n", distance(32.9697, -96.80322, 29.46786, -98.53506, "K"))
fmt.Printf("%f Nautical Miles\n", distance(32.9697, -96.80322, 29.46786, -98.53506, "N"))
}
```