Because of tidal friction and aggrandizement of the earth's volume, the earth's rotation angular velocity slows down.

随着潮汐摩擦力和地球体积的增大，地球自转角速度变慢。

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In their paper, the co-authors argue that gravitational tidal heating caused by the gravitational friction of an earth-like exo-moon on an eccentric orbit around a Jupiter-like planet lying at a Jupiter-like distance from its parent star, could, in fact, create habitable conditions.

FORBES: Earth-Like Exo-Moons Can Lurk Well Beyond Planetary Habitable Zones, Say Astronomers