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  2. Theory of tides - Wikipedia

    en.wikipedia.org/wiki/Theory_of_tides

    The calculations of tide predictions using the harmonic constituents are laborious, and from the 1870s to about the 1960s they were carried out using a mechanical tide-predicting machine, a special-purpose form of analog computer. More recently digital computers, using the method of matrix inversion, are used to determine the tidal harmonic ...

  3. Tide - Wikipedia

    en.wikipedia.org/wiki/Tide

    Variations with periods of less than half a day are called harmonic constituents. Conversely, cycles of days, months, or years are referred to as long period constituents. Tidal forces affect the entire earth, but the movement of solid Earth occurs by mere centimeters. In contrast, the atmosphere is much more fluid and compressible so its ...

  4. Tide-predicting machine - Wikipedia

    en.wikipedia.org/wiki/Tide-predicting_machine

    a Tide Predicting Machine built in 1947 for the Norwegian Hydrographic Service by Chadburn of Liverpool, and designed to compute 30 tidal harmonic constituents; used until 1975 to compute official Norwegian Tide Tables, before being superseded by digital computing. [21] the Doodson-Légé TPM built in 1949, an East German TPM built 1953-5. [22]

  5. Nonlinear tides - Wikipedia

    en.wikipedia.org/wiki/Nonlinear_tides

    Using a simple harmonic fitting algorithm with a moving time window of 25 hours, the water level amplitude of different tidal constituents can be found. For 2011, this has been done for the M 2 {\displaystyle M_{2}} , M 4 {\displaystyle M_{4}} and M 6 {\displaystyle M_{6}} constituents.

  6. Amphidromic point - Wikipedia

    en.wikipedia.org/wiki/Amphidromic_point

    The tidal range (the peak-to-peak amplitude, or the height difference between high tide and low tide) for that harmonic constituent increases with distance from this point, though not uniformly. As such, the concept of amphidromic points is crucial to understanding tidal behaviour. [ 3 ]

  7. Tides in marginal seas - Wikipedia

    en.wikipedia.org/wiki/Tides_in_marginal_seas

    These overtides are multiples, sums or differences of the astronomical tidal constituents and as a result the tidal wave can become asymmetric. [18] A tidal asymmetry is a difference between the duration of the rise and the fall of the tidal water elevation and this can manifest itself as a difference in flood/ebb tidal currents. [19]

  8. Bill Republicans say would undo 'parents' bill of rights ...

    www.aol.com/news/bill-republicans-undo-parents...

    “The people of Washington are sick of this tyranny, and we want a balanced government that protects our most vulnerable constituents and doesn’t go down the pathway of crazy radical ideology ...

  9. Arthur Thomas Doodson - Wikipedia

    en.wikipedia.org/wiki/Arthur_Thomas_Doodson

    In 1921, Doodson published a major work on tidal analysis. [4] This was the first development of the tide-generating force to be carried out in harmonic form: Doodson distinguished 388 tidal frequencies. [5] Doodson's analysis of 1921 was based on the then-latest lunar theory of Ernest William Brown. [6]