"I began to expound upon tidal effects
When you asked me to stop, looking somewhat perplexed."
– Data, 2369 ("Schisms")

Tides are the rise of fall of sea levels, or occasionally liquids other than water, on a planet or moon due to the gravitational influence of other celestial bodies or of artificial gravity systems.

The planet Argo had strong tides. (TAS: "The Ambergris Element")

In 2366, the planet Bre'el IV experienced dangerously high tides due to a descending asteroidal moon. (TNG: "Deja Q")

In 2367, Data modeled that the moon Peliar Zel Beta would experience erratic tidal surges if no action were taken. (TNG: "The Host")

The planet Balosnee VI supposedly had a tidal harmony that could cause pleasant hallucinations. (DS9: "The Nagus")

The fifth moon of Mixtus III created tides on that planet that allowed for summer crops; it was destroyed in 2380, with artificial gravity systems the proposed solution for ensuring the tidal effects continued. (LD: "Cupid's Errant Arrow")

Tides were also used as a metaphor, for example by Gowron for the "tides of fortune", (DS9: "By Inferno's Light") or by Tam Elbrun for other people's emotions. (TNG: "Tin Man")

Note that "tidal waves" are not caused by tides, despite the colloquial name.

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