For Millions of years there have been tides across the globe; usually consisting of two high and two low tides. Tides occur roughly every six hours.
Tides are created by the combined gravitational pull of the Sun and Moon on the earth (Other heavenly bodies, such as the planets of our solar system, also have an impact; these impacts are so miniscule that it is safe to ignore them.
To predict you could do one of several options:
« Buy a tide time table (a lot of surf shops provide them free!)
« Look on the internet (www.magicseaweed.co.uk, http://www.bbc.co.uk/cornwall/surfing/ or the like!
« Buy a tide clock and set it to your favourite break.
« Use deduction e.g. “If tides happen every six hours, the next low tide will be six hours on from the last high tide.” Simple innit!
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