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Chapter 4, page 1.
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| 4.1 |
4.1 Two ways of representing the ocean tides.
4.2 Two approaches to explain the ocean tides.
4.3 Values of attraction.
4.4 The direction of the tide waves.
4.5 The continents and the flowing of the tide waves.
4.6 Number of the tide waves.
4.7 Tide waves and sublunar points.
4.8 The physical equation for the ocean tides.
4.9 When Earth, Moon and Sun are aligned.
4.10 Tide cadences.
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Fig
nr. 1 |
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The ocean tides observed from the space.
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| .1 |
First thing, watch the movie by NASA \ PO.DAAC.
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Representing the ocean tides.
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| .2 |
Still today, even after the publication of this movie, the classic representation, shown beloow, remains the most usual one.
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The classic way of representing the ocean tides.
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| .3 |
The attraction of the moon is strongest on the side of the earth which it is facing. Here the above-average pull causes the waters to bulge out toward the moon in a high tide. At the same time, on the far side of the earth, the moon's attraction is at it's weakest, and the waters on that side bulge away from the moon, in an equal and opposite high tide.
(source: http://www.the-sea.org/tides.htm)
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Fig
nr. 2 |
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| .4 |
“... the combination of gravity and inertia create two bulges of water. One forms where the Earth and Moon are closest, and the other forms where they are furthest apart. Over the rest of the globe gravity and inertia are in relative balance. Because water is fluid, the two bulges stay aligned with the Moon as the Earth rotates” (NOAA: Ross, D.A., 1995).
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| .5 |
You can find this explanation everywhere: in textbooks, in tv documentaries, and now in web pages.
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Admission.
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| .6 |
The figure #2 has become the current commonplace representation of how ocean tides would work. Though, some proponents of the current theory admit that the figure #1, in practice, represents something that would be real, if the things were different.
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| .7 |
(current approach) Indeed, only if the Earth were completely covered with water, and if its ocean were very deep, the attraction exerted by the Moon and the Sun would produce two bulges of water, one facing the Moon, the other would be found on the opposite side of our planet - as in the figure #1.
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Comment.
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| .8 |
The classic explanation, among other things, is the consequence of an implicit assumption, of “common sense”: that the space, on which the cause operates, is the same as the space of the effects.
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| .9 |
In practice, it is not. With regard to the times of the action of the Moon and Sun, there are the delayed times of the effects, which give rise to multiple space units, where, inside each one, there is a single tide wave |
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See later in chapter six, “the mechanism of the tides”, and in particular, on page 6.8, “the delimitation of the field of action of a tide”.
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Alternative approach.
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| .10 |
The movie by NASA \ PO.DAAC. has laid bare more than one point, in the common way of explaining the ocean tides. We are now compelled to consider them confined in basins.
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| .11 |
The movie, the phenomenon of the “water figures”, the results in the research on seeds, all of them have prompted a fresh approach, the one presented in this site. Where, the tide phenomenon is seen as, the delayed effect, of the variation of the water density, due to the combined action of the Moon, and of the Sun.
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The vantage point from where to observe the tides.
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| .12 |
The best place from where to observe, the tide of an ocean (or the tide of a sea), and understand its behaviour, surely is not a point of its coast.
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| .13 |
It is from high above a single basin that a tide wave has to be analyzed.
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#15 - A tide basin.
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| .14 |
An ocean tide takes place within a tide basin. There are numerous tide basins, which may be small, large, big, enormous. Inside each basin there is one tide system, autonomous with regard to those of the other basins.
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Basin of the North East Atlantic, where tides occur twice a day, as in the majority of basins.
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Figure
# 3
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At the passage of the Moon on the meridian, the high tide is where the red line is. At the successive hours, the high tide wave moves to the successive lines, counterclockwise.
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See colour code valid for chapter 4, used to differentiate two ways to explain the ocean tides.
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