The rule of tenths is a ready reckoner which you can use as a rough guide to working out the current height of tide in your head. It’s very easy to do – it’s based on percentages and all you need is the range for day.
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The rule of tenths is a ready reckoner which you can use as a rough guide to working out the current height of tide in your head. It’s very easy to do – it’s based on percentages and all you need is the range for day.