Talk:Tide

message: A discussion is taking place to address the redirect :Tied. The discussion will occur at Wikipedia:Redirects for discussion/Log/2020 August 25#Tied until a consensus is reached, and readers of this page are welcome to contribute to the discussion.  Paul_012 (talk) 19:57, 25 August 2020 (UTC)
thread_title:  "Tied" listed at [[Wikipedia:Redirects for discussion|Redirects for discussion]] 

message: I have just removed the following text block from sea from the section on "tides". Maybe some of it could be useful for this article? Here it is:
Tidal flows of seawater are resisted by the water's inertia and can be affected by land masses. In places like the Gulf of Mexico where land constrains the movement of the bulges, only one set of tides may occur each day. Inshore from an island there may be a complex daily cycle with four high tides. The island straits at Chalkis on Euboea experience strong currents which abruptly switch direction, generally four times per day but up to 12 times per day when the moon and the sun are 90 degrees apart. See also the commentary about this explanation in  Where there is a funnel-shaped bay or estuary, the tidal range can be magnified. The Bay of Fundy is the classic example of this and can experience spring tides of . Although tides are regular and predictable, the height of high tides can be lowered by offshore winds and raised by onshore winds. The high pressure at the centre of an anticyclones pushes down on the water and is associated with abnormally low tides while low-pressure areas may cause extremely high tides.
In 1900, Galveston, Texas experienced a  surge during a hurricane that overwhelmed the city, killing over 3,500 people and destroying 3,636 homes.
EMsmile (talk) 09:12, 9 March 2021 (UTC)
thread_title: A chunk of text about tides that might be useful to integrate?

message: In the section Lunar distance  is not supported by the reference.--S Philbrick(Talk) 15:04, 15 July 2021 (UTC)
replies: text: Found a reference at NOAA which says just the opposite and changed the section. StarryGrandma (talk) 19:41, 16 July 2021 (UTC)
thread_title:  Citation issue 

message: I wanted to improve the format of the subscripts in subsection "Analysis" of section "Observation and prediction", namely change every occurence in the text of "A_o" and "" with "".  Also, replace "A" with "" at one point in the same subsection.  Here are the full current and proposed versions:
Current
where
*  is the amplitude.
*  is the angular frequency, usually given in degrees per hour corresponding to  measured in hours.
*  is the phase offset with regard to the astronomical state at time t = 0 . 
There is one term for the Moon and a second term for the Sun. The phase  of the first harmonic for the Moon term is called the lunitidal interval or high water interval. 
The next refinement is to accommodate the harmonic terms due to the elliptical shape of the orbits. To do so, the value of the amplitude is taken to be not a constant, but varying with time, about the average amplitude . To do so, replace  in the above equation with  where A is another sinusoid, similar to the cycles and epicycles of Ptolemaic theory. This gives:
:  A(t) = A_o\bigl(1 + A_a \cos\,(\omega_a t + p_a)\bigr) 
which is to say an average value  with a sinusoidal variation about it of magnitude , with frequency  and phase . Substituting this for A_o in the original equation gives a product of two cosine factors:
Proposed
where
*  is the amplitude.
*  is the angular frequency, usually given in degrees per hour corresponding to  measured in hours.
*  is the phase offset with regard to the astronomical state at time t = 0 . 
There is one term for the Moon and a second term for the Sun. The phase  of the first harmonic for the Moon term is called the lunitidal interval or high water interval. 
The next refinement is to accommodate the harmonic terms due to the elliptical shape of the orbits. To do so, the value of the amplitude is taken to be not a constant, but varying with time, about the average amplitude . To do so, replace  in the above equation with  where  is another sinusoid, similar to the cycles and epicycles of Ptolemaic theory. This gives:
:  A(t) = A_o\bigl(1 + A_a \cos\,(\omega_a t + p_a)\bigr) 
which is to say an average value  with a sinusoidal variation about it of magnitude , with frequency  and phase . Substituting this for  in the original equation gives a product of two cosine factors: Pattedetable (talk) 03:19, 7 September 2022 (UTC)
replies: text: Basedeunie042 (talk) 16:39, 12 September 2022 (UTC)
thread_title:  Semi-protected edit request on 7 September 2022 

message: :
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:* 
Between extremes, there is change.  So – call me thick – if a region has the first two, how can it not have all four of these stages? —Tamfang (talk) 04:35, 23 April 2023 (UTC)
replies: text: I have no idea what this section of text is saying. You don't get to high tide stage without a flood tide and you don't get to a low tide without an ebb tide - and why the links to 'local minimum' and 'local maximum'? - these links are simply descriptions of how mathematicians put graphs together. Perhaps someone else will get around to sorting this out before I do. Geopersona (talk) 07:43, 9 October 2023 (UTC)
replies: text: A local minimum is a point where a value is lower than elsewhere in its neighborhood.  The term is presumably used here to suggest that a "low tide" may be higher than the low tide of a week earlier, without invalidating its claim to be "low tide". —Tamfang (talk) 08:30, 4 November 2023 (UTC)

text: Boldly changed. —Tamfang (talk) 08:30, 4 November 2023 (UTC)
thread_title:  Stages 

message: In a few places, the relative contributions from the Moon and the Sun to the tides are compared, saying that the Sun's is "much smaller" than the Moon's. A simple evaluation of the formula given there gives a ratio of tidal forces of roughly F_M : F_S = 2.2 : 1. This is not "much smaller" at any rate. This is particularly important as there are indeed effects that are "much smaller", for example the influence of Jupiter or even the explanations for the spring and neap tides across the seasons, equinoxes etc. 
I therefore made a few edits replacing "much smaller" by "smaller" in the relevant places (simply searching for "much").
DieHenkels (talk) 20:34, 21 August 2023 (UTC)
thread_title:  Much less?