tides

n.

the periodic rise and fall of the sea level under the gravitational pull of the moon

something that may increase or decrease (like the tides of the sea)

"a rising tide of popular interest"

there are usually two high and two low tides each day

同义词：lunar time period

Tides, Surges and Mean Sea-Level
Tides, surges and mean sea level
The tides of the planet earth
On charting global ocean tides
Protoplanet Migration by Nebula Tides ☆
TOPEX/POSEIDON tides estimated using a global inverse model
Modelling the global ocean tides: a modern insight from FES2004
Atmospheric tides: 1. Model description and results for the solar diurnal component
Evolution of binary stars and the effect of tides on binary populations
Migrating and nonmigrating diurnal tides in the middle and upper atmosphere excited by tropospheric latent heat release