According to TimeAndDate.com, our planet completed one rotation more quickly than scientists had ever before observed.  

On Wednesday, June 29, Earth completed one rotation of its axis in 1.59 milliseconds, or less than 24 hours.

Hold on! Right, the Earth rotates once on its axis in exactly 24 hours. Yes, almost, but not quite. 

It had been believed, up until a few years ago, that the Earth's rotation was slowing down as a result of numerous subsequent atomic clock measurements made since 1973. 

It had been believed, up until a few years ago, that the Earth's rotation was slowing down as a result of numerous subsequent atomic clock measurements made since 1973.

In order to account for the slower spin, the International Earth Rotation and Reference Systems Service (IERS) had even started to occasionally add leap seconds (it last happened on December 31, 2016).

That may still be the case over a longer period of time; the Earth's rotation may still be generally slowing down. 

After all, the Earth's rotation is being slowed down over time by the Moon.  

Tides are produced by its gravitational pull, which also alters the Earth's orbital path around the Sun.

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