docs: def calculate_boundingbox(lng, lat, miles):
      """
      Given a latitude, longitude and a distance in miles, calculate
      the co-ordinates of the bounding box 2*miles on long each side with the
      given co-ordinates at the center.
      """
  
      latChange = change_in_latitude(miles)
      latSouth = lat - latChange
      latNorth = lat + latChange
      lngChange = change_in_longitude(lat, miles)
      lngWest = lng + lngChange
      lngEast = lng - lngChange
      return (lngWest, latSouth, lngEast, latNorth)