Chapter 5, page 3
5.3 5.1 The action by the Moon and the Sun.
5.2 The physical equation valid for the ocean tides.
5.3 The space unit of an ocean tide.
5.4 The tide wave cadence.
5.5 The time taken by a tide wave.
5.6 The direction of the action.
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#14 - Space units of the ocean tides.
.1 The ocean tides are cyclical variations of the water level.
.2 Since the ocean tides are due to the action by the Moon, and to that by the Sun, our common sense suggest that their space unit is the Earth.
.3 Indeed, the ocean tides have not a single space unit, the Earth; but many space units, the “tide basins”; each of them has its tide.
The North East Atlantic basin, where tides occur twice a day, as in the majority of basins.
Figure
# 1
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 (because the basin is in the northern magnetic hemisphere).
The direction of the tide wave.
.4 A tide wave goes around the centre of its basin; clockwise if on the southern hemisphere; counter-clockwise, if on the northern one.
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