The Trident Time and Tide is a combination time and tide The Trident Time and Tide wall clock features bold, white, easy-to-read lettering on a black face. The time is marked with white hands while the rising and falling of the tide is indicated with a red hand. This large (10 inch diameter) time and tide clock is housed in a black resin case with an acrylic crystal. The tide sector averages the Atlantic lunar tide cycle.