The sine curve traces the predicted level of the ocean surface through a 24 hour interval from midnight to midnight. A stipple pattern fills in the time of darkness and partial stipple patterns fill times of twilight.
Moon phase is indicated by a partial circle and by a percentage.
Annotations give times of twilight, sunrise, sunset, high tide time and height and low tide time and height. Tidal heights are given in meters above average low water level by the scale to the left of the graph. The tidal range is the difference in elevation of the high and low tides. Compute the tidal range in feet for St. Catherines Island. Return to Coastal Georgia .