The graph view, arrived at by rotating the iPad to landscape (wide) orientation, is a calendar of the month. It’s simple, just shows the curve for each day, but if you tap the day you get a view that includes the sun times; moon times; civil, nautical, and astronomical twilight times, and the percent of moon that is lit. And the graph shown for the day is interactive; tap and drag to show the tide/current during the day.

The calendar view