These clocks are extremely precise devices that measure atom vibrations to maintain time.

Scientists think a number of things, including changes in the atmosphere, the melting of glaciers, motion in the Earth’s core, and a weakening magnetic field, could be causing the planet to spin faster, though the precise cause is yet unknown.

A solar day is when the Earth completes one full spin, which typically takes 24 hours, or precisely 86,400 seconds.

On July 5, 2024, a year ago, Earth spun 1.66 milliseconds faster than the typical 24-hour day, making it the fastest day ever recorded.

Even though today’s shorter day might not seem like much, scientists have discovered that the time difference can have an impact on everything from GPS accuracy and satellite systems