Tide clock

Along many coastlines, the Moon contributes the major part (67%) of the combined lunar and solar tides.

There is one hand on the clock face, and along the left side it points to the number of hours "until" the (lunar) high tide.

Some tide clocks incorporate time (using standard quartz movement) and even humidity and temperature in the same instrument.

Also, in addition to the relative position of the moon and the elliptical pattern of the sun, the tide can be affected to some degree by wind and atmospheric pressure.

Analog tide clocks are most accurate for use on the Atlantic coasts of America and Europe.

This is because along the Atlantic coastline the moon controls the tides predictably, ebbing and flowing on a regular (12- to 13-hour) schedule.

Similarly, there are areas in the world like the Gulf of Mexico or the South China Sea that have only one high tide a day.

Smart digital tide clocks can work across all locations in North America without any adjustments.