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Q&A

Can one or multiple moon(s) pull the sea around my planet?

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I'm building a world which is 50% covered by the sea. For approximately half the year, the sea covers one hemisphere; for the other half it moves to the other hemisphere, leaving the first a dry sea-bed, until the seas return again the following year. My working assumption is that the sea is dragged around the planet by the gravitational pull of its moon(s).

My main question is, how big and/or close would the moon need to be to cause such a huge tidal shift, and what kind of orbit would it have?

If it is not possible for a single moon to have such an effect by itself, could it be achieved if there were secondary moons and/or other gravitational forces affecting the seas, either directly or by their impact on the orbit of the primary moon?

All help gratefully received!

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This post was sourced from https://worldbuilding.stackexchange.com/q/96181. It is licensed under CC BY-SA 3.0.

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