Tide clocks keep track of the moon as it orbits the earth, with the face of the tide clock displaying high tide at the top and low tide at the bottom. The bottom of the tide clock dial is marked "low tide" and the top of the tide clock dial is marked "high tide." The left side of the dial is marked "hours until high tide" and has a count-down of hours from 5 to 1. 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. The right hand side of the clock is marked "hours until low tide" and has a count-down of hours from 5 to 1. The number pointed to by the hand gives the time "until" the (lunar) low tide. Some tide clocks count down the number of hours from high or low tide, as in "one hour past high or low tide". When the clock reaches the half way point ("half-tide"), it then counts the hours up to high tide or low tide, as in "one hour until high or low tide". Tide clocks are the perfect accessory for anyone that lives near tidal influenced areas. Surfers, boaters and fisherman can all benefit from a tide clock and they make perfect gifts!