Sökte lite ang. intervalen mellan högt reps. lågtvatten=
The moon appears to rotate around the earth each day, however it is the earth’s rotation that gives this appearance. The moon actually orbits the earth in an elliptical pattern, taking 27.3 days to complete one orbit. The length of time that it takes for the earth to rotate around so that the moon is in the same position is actually a little over a normal 24 hour day. It is 24 hours and 50 minutes or a tidal day. That is why the tidal cycle starts approximately 50 minutes later each day. As the earth rotates, the moon’s gravitational force continually mounds the water and that fluid mound moves around the earth. The actual height of the tide is influenced by the shape of the coastline and depth of the water.