Cotidal Hour

Science / Tides and Currents / Cotidal Hour: The average interval between the Moon's transit over the meridian of Greenwich and the time of the following high water at any place. This interval may be expressed either in solar or lunar time. When expressed in solar time, it is the same as the Greenwich high water interval. When expressed in lunar time, it is equal to the Greenwich high water interval multiplied by the factor 0.966.
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Quarter Hour Audience

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Planetary Hours

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Summer Hours

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