A true Earth day isn’t 24 hours
Earth spins in about 23 h 56 m relative to the stars. The 24‑hour day includes the extra time to catch up with the Sun.Earth: The 23-Hour-56-Minute Day
The clock is slowing
Tidal friction from the Moon lengthens Earth’s day by about 23 microseconds per year.Earth: The 23-Hour-56-Minute Day
