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2. Tide gauge - Wikipedia

   en.wikipedia.org/wiki/Tide_gauge

   A tide gauge The tide gauge in Kronstadt, Russia [1] A tide gauge is a device for measuring the change in sea level relative to a vertical datum. [2] [3] It is also known as a mareograph, [4] marigraph, [5] and sea-level recorder. [6] When applied to freshwater continental water bodies, the instrument may also be called a limnimeter. [7] [8]

3. Tidal range - Wikipedia

   en.wikipedia.org/wiki/Tidal_range

   Tidal range is the difference in height between high tide and low tide. Tides are the rise and fall of sea levels caused by gravitational forces exerted by the Moon and Sun, by Earth's rotation and by centrifugal force caused by Earth's progression around the Earth-Moon barycenter. Tidal range depends on time and location.

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 ...

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   en.wikipedia.org/wiki/File:Mandala_Coloring...

   This anti-stress printable coloring book is free and waiting for you to download. You are the most important person in your life – being the best you means being the best for people around you, SO GET FREE MANDALA COLORING PAGES NOW AND NOURISH YOUR MIND!

6. Rule of twelfths - Wikipedia

   en.wikipedia.org/wiki/Rule_of_twelfths

   Graph showing relationships between the rule of twelfths (coloured bars), a sine wave (dashed blue curve) and a clockface, if high tide occurs at 12:00. The rule of twelfths is an approximation to a sine curve. It can be used as a rule of thumb for estimating a changing quantity where both the quantity and the steps are easily divisible by 12 ...

7. Chart datum - Wikipedia

   en.wikipedia.org/wiki/Chart_datum

   Tide tables give the height of the tide above a chart datum making it feasible to calculate the depth of water at a given point and at a given time by adding the charted depth to the height of the tide. One may calculate whether an area that dries is under water by subtracting the drying height from the [given] height calculated from the tide ...

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   mail.aol.com/m

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9. Newlyn Tidal Observatory - Wikipedia

   en.wikipedia.org/wiki/Newlyn_Tidal_Observatory

   The Ordnance Survey established the observatory in 1915 to contribute to the measurement of a national vertical datum defined by mean sea level.The subsequent 6-year measurement campaign at the observatory, conducted from 1 May 1915 to 30 April 1921, determined the value of mean sea level as 4.751 m (15.59 ft) below the level of the brass bolt benchmark inside the hut.