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Tides. Tides. GRAVITATION. M. G. 1/R 2. Gravitational force. B. A. C. •. •. •. •. •. •. Earth. Moon. A little more reality. Path of moon ’ s centre. x. Common centre of gravity. Path of earth ’ s centre.
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GRAVITATION M G 1/R2
Gravitational force B A C • • • • • • Earth Moon
A little more reality Path of moon’s centre x Common centre of gravity Path of earth’s centre Both the earth and the moon revolve around their common centre of gravity
A little more reality 1 Common centre of gravity 4 x 2 3 Path of earth’s centre
A little more reality 1 Common centre of gravity 4 x 2 3 Path of earth’s centre
Different tide cycles Diurnal Tide
Different tide cycles Semidiurnal Tide
Different tide cycles Mixed Semidiurnal Tide
Tide Levels and Chart Datum Mhws - Mean High Water on the Spring tide Mhws - Mean Low Water on the Spring tide Mhws - Mean High Water on the Neaptide Mhws - Mean Low Water on the Neaptide Mtl - Mean Tide Level MHWS MHWN Neap Range Spring Range MTL MLWN MLWS Chart Datum
Tides and Weather Parlee Beach
Tides and Weather Saxby Gale - 1869