TidePull

Explore how the Moon and Sun reshape a schematic ocean surface under equilibrium tide theory. Drag a day-of-year control to move approximate lunar and solar longitudes, then watch a Canvas drawing of the tidal ellipsoid with high- and low-water markers.

Compare spring and neap geometries side by side, inspect a local height curve in semi-diurnal or diurnal teaching modes, and review celestial angle relationships that drive tidal range. Open the equilibrium theory sheet for the potential formula used by the model.

All calculations run on device. No account is required.