On average, a mean solar day in the last 365 days was -0.05 ms under 24 hours, so today's day length is above average. This is the time it takes Earth to rotate 1.39 cm (0.55 in), as measured at the equator. Today is predicted to be 0.0299 ms (milliseconds) or 0.0000299 seconds longer than 24 hours. Recently, our planet has been speeding up a little, making for slightly shorter days. Within this general trend, however, there is fluctuation: sometimes the Earth spins a bit faster, sometimes a bit slower. Over the course of a century, the length of a day increases by a couple of milliseconds (where 1 millisecond equals 0.001 seconds). The Moon is-very gradually-slowing the Earth's rotation because of friction produced by tides. The Earth's rotation is not constant, so in terms of solar time, most days are a little longer or shorter than that. Modern timekeeping defines a day as the sum of 24 hours-but that is not entirely correct. ©/nukleerkedi Earth's Rotation Defines Length of Day The Earth's rotation slows down over time. ![]() Business Date to Date (exclude holidays).
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