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A clean timeless classic look priced to move. Case is solid polished brass and finished with a protective lacquer coating.Scratch resistant acrylic lens. Mounting hardware included. Five year manufacturer's warranty.
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|How Time & Tide Clocks Work|
Tides are the
rise and fall of ocean waters caused by the
gravitational forces mainly between the Earth and the Moon
(the Sun also generates tidal forces, but they are much smaller).
These forces cause the oceans to stretch towards and away from the
moon, forming two
The Earth rotates through these two tidal bulges causing two HIGH tides and two LOW tides every Lunar day. A Lunar day is 24 hours and 50 minutes long. This is longer than a solar day (24 hours) because the Moon revolves around the Earth in the same direction as the Earth rotates. It takes a little longer until the Moon is over the same position.
Since the Moon has the greatest effect on the tides, ALL tide clocks are synchronized to the Lunar day and will indicate a HIGH tide every 12 hours and 25 minutes (two times per Lunar day).
Think of it this way:
One of these factors is that the large continental land masses interfere with the Westward travel of the tidal bulge and this causes many complex tidal cycles,especially on the West coast of North America. Ocean floor topography, bays and narrow inlets can cause resonance effects and even weather conditions can alter the timing of the tidal cycle. For these reasons, Tide clocks will be more accurate in some areas than others.
Tide clocks can only be accurate in the red areas