code: public static int latitudeToTileY(double latitude, byte zoomLevel) {
          return pixelYToTileY(latitudeToPixelY(latitude, zoomLevel, DUMMY_TILE_SIZE), zoomLevel, DUMMY_TILE_SIZE);
      }
docs: Converts a latitude coordinate (in degrees) to a tile Y number at a certain zoom level.
  
  @param latitude  the latitude coordinate that should be converted.
  @param zoomLevel the zoom level at which the coordinate should be converted.
  @return the tile Y number of the latitude value.