public static function boundingBox($latitude, $longitude, $mileRange) {
      $maxLatitude = $latitude + $mileRange / self::EQUATOR_LAT_DEGREE_IN_MILES;
      $minLatitude = $latitude - ($maxLatitude - $latitude);

      $maxLongitude = $longitude + $mileRange / (cos($minLatitude * M_PI / 180) * self::EQUATOR_LAT_DEGREE_IN_MILES);
      $minLongitude = $longitude - ($maxLongitude - $longitude);

      return array('lat' => array('max' => $maxLatitude,
                                  'min' => $minLatitude),
                   'lon' => array('max' => $maxLongitude,
                                  'min' => $minLongitude));
    }