Millions expected to observe total solar eclipse in North America. For four minutes, the sun will be replaced by a simple luminous circle around the moon.

The partial eclipse will be visible almost everywhere on the continent, but it will be total on a path from Mazatlán to Mexico. The total eclipse is a phenomenon that will not occur again for 20 years. Niagara Falls, a place famous for its honeymoons, has never seen such crowds, says RFI's correspondent in Quebec.