Pick a view along the top. Drag the Moon, or use the slider. Everything here is optional.
Coast shape
A funnel bay squeezes the tide into a narrow space, so in the model its range is about four times bigger. The size of the bulges in the ocean stays the same. Compare shows both at the same instant and the same height scale.
Text size
Keys: 1 to 4 pick a view, S starts the story, Space plays or pauses, E changes the speed, [ and ] step one hour (with Shift, one day), N F and Q jump to new, full and quarter Moon, A adds the Sun, W shows or hides the pull arrows, G shows the spring and neap lines, T shows or hides the chart under the picture, V switches the camera, M switches the chart between a day and a month, O B and K pick open coast, funnel bay or compare, Y switches between the model and a real place, U switches meters and feet, R or 0 resets, C controls, L lesson, P presents, D light or dark, Esc closes panels. With a picture focused, Left and Right arrows move the Moon (or turn the coast), Up and Down move the time by an hour.