The Analog has hefty solid cast brass casing, scuttle clamps, bevelled glass fronts and brass hands with black subsidiary indicators on light cream faces. Tide Clocks are influenced by the orbit of the moon around the Earth. To show this, our tide clock has an extra hand, which makes a complete sweep at the lunar rate of approximately 12. 5 hours instead of the normal 12. (Please note: because the lunar cycle varies with the Earth’s, there are times in a month when actual tides are a few minutes ahead or behind the clock). Face diameter 14 cm, depth 6 cm.