Chapter 4, page 8.
4.8 4.1 Action by the Moon and by the Sun.
4.2 Modality of action: attraction.
4.3 The ocean tides observed from the space.
4.4 Values of attraction.
4.5 The direction of the tide waves.
4.6 The continents and the flowing of the tide waves.
4.7 Number of the tide waves.
4.8 Tide waves and sublunar points.
4.9 The physical equation for the ocean tides.
4.10 When Earth, Moon and Sun are aligned.
4.11 Tide cadences.
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#10 - Tide waves and sublunar points.
.1

(current approach) ... the two bulges (tide waves) tend to keep themselves in the same relation with the position of the Moon.
.2 (alternative approach) The tide waves develop within a basin, independently from what occurs in the other ones.
.3 The tide waves have a direct relation with the passage of the Moon on the meridian only on a limited section of each basin, as one can see on the film made by NASA.
.4 It is the same in the case of semi-diurnal basins, when the passage of the Moon occurs above the opposite meridian.
fig.
1
.5

In the eastern basin of the North Atlantic, where tides occur twice a day, the cotidal lines (in red) show the average delay given in hours of the first tide after the passage of the moon on the meridian, as well the average delay of the second tide after the passage of the moon above the opposite meridian.
.6
The time difference between the tide wave and the passage of the Moon on the meridian (or on the opposing one in the case of a semidiurnal basin) is called lunitidal interval.
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