article_snippet: Although it is dubbed the ‘tide of the century’, the ‘supertide’ phenomenon occurs once every 18 years when a rare alignment of the sun, moon and Earth create a massive gravitational pull on the sea.
article_snippet: The ‘supertide’ phenomenon occurs once every 18 years when a rare alignment of the sun, moon and Earth create a massive gravitational pull on the sea.
article_snippet: The ‘supertide’ phenomenon occurs once every 18 years when the sun, moon and Earth align and the gravitational pull boosts water levels .