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  2. Tide clock - Wikipedia

    en.wikipedia.org/wiki/Tide_clock

    Due to the Moon's orbital prograde motion, it takes a particular point on the Earth (on average) 24 hours and 50.5 minutes to rotate under the Moon, so the time between high lunar tides fluctuates between 12 and 13 hours. A tide clock is divided into two roughly 6 hour tidal periods that show the average length of time between high and low ...

  3. Tide - Wikipedia

    en.wikipedia.org/wiki/Tide

    Its period is about 12 hours and 25.2 minutes, exactly half a tidal lunar day, which is the average time separating one lunar zenith from the next, and thus is the time required for the Earth to rotate once relative to the Moon. Simple tide clocks track this constituent. The lunar day is longer than the Earth day because the Moon orbits in the ...

  4. Tide table - Wikipedia

    en.wikipedia.org/wiki/Tide_table

    Tide tables, sometimes called tide charts, are used for tidal prediction and show the daily times and levels of high and low tides, usually for a particular location. [1] Tide heights at intermediate times (between high and low water) can be approximated by using the rule of twelfths or more accurately calculated by using a published tidal ...

  5. Rule of twelfths - Wikipedia

    en.wikipedia.org/wiki/Rule_of_twelfths

    The total increase in water level between low and high tide would be: 14 - 2 = 12 metres. In the first hour the water level would rise by 1 twelfth of the total (12 m) or: 1 m; In the second hour the water level would rise by another 2 twelfths of the total (12 m) or: 2 m; In the third hour the water level would rise by another 3 twelfths of ...

  6. Tide dial - Wikipedia

    en.wikipedia.org/wiki/Tide_dial

    A tide dial, also known as a mass dial [2] or a scratch dial, [3] [4] is a sundial marked with the canonical hours rather than or in addition to the standard hours of daylight. Such sundials were particularly common between the 7th and 14th centuries in Europe, at which point they began to be replaced by mechanical clocks. There are more than ...

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