Complete circular rainbows can be seen under the right conditions; in particular, when viewing the mists over Niagara Falls early or late in the day.<ref>[http://www.porterfieldsfineart.com/josephholodook/images/leprechaun72.jpg]</ref> | Complete circular rainbows can be seen under the right conditions; in particular, when viewing the mists over Niagara Falls early or late in the day.<ref>[http://www.porterfieldsfineart.com/josephholodook/images/leprechaun72.jpg]</ref> |