New Quartz HR1688 Ticking Tide Time Clock Movement Mechanism Motor Black Hands
£13.99
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Tide clocks or "indicators" show how much time before high or low tide.
The lunar day, or time it takes the moon to reappear at the same place in the sky, is
24 hours and 50 minutes. Most locations have two tides each day. Because of this,
your tide hand rotates every 12 hours and 25 minutes or twice daily.