code: function(center, radius) {
    var latDegrees = radius/g_METERS_PER_DEGREE_LATITUDE;
    var latitudeNorth = Math.min(90, center[0] + latDegrees);
    var latitudeSouth = Math.max(-90, center[0] - latDegrees);
    var longDegsNorth = metersToLongitudeDegrees(radius, latitudeNorth);
    var longDegsSouth = metersToLongitudeDegrees(radius, latitudeSouth);
    var longDegs = Math.max(longDegsNorth, longDegsSouth);
    return [
      [center[0], center[1]],
      [center[0], wrapLongitude(center[1] - longDegs)],
      [center[0], wrapLongitude(center[1] + longDegs)],
      [latitudeNorth, center[1]],
      [latitudeNorth, wrapLongitude(center[1] - longDegs)],
      [latitudeNorth, wrapLongitude(center[1] + longDegs)],
      [latitudeSouth, center[1]],
      [latitudeSouth, wrapLongitude(center[1] - longDegs)],
      [latitudeSouth, wrapLongitude(center[1] + longDegs)]
    ];
  }
docs: Calculates eight points on the bounding box and the center of a given circle. At least one
  geohash of these nine coordinates, truncated to a precision of at most radius, are guaranteed
  to be prefixes of any geohash that lies within the circle.
  
  @param {Array.<number>} center The center given as [latitude, longitude].
  @param {number} radius The radius of the circle.
  @return {Array.<Array.<number>>} The eight bounding box points.