Earth’s day lengthens by about 1.7 milliseconds each century
Tidal friction between Earth and the Moon slowly brakes our planet’s spin, adding roughly 1.7 milliseconds to the length of a day every hundred years while the Moon drifts outward.
Ancient eclipse records and coral growth bands confirm days were shorter in the deep past — hundreds of millions of years ago, a year held more than today’s 365 days.
Time itself is geological. Earth’s lengthening day links ocean tides to atomic clocks and leap seconds, proving the ground beneath us quietly rewrites the calendar.
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