Earth’s Shortest Day Recorded

On 10^th July, Earth recorded its shortest day of 2025, completing rotation 1.36 milliseconds faster than the standard 24 hours.

• The phenomenon is measured by atomic clocks and influenced by factors like the Moon’s position, atmospheric shifts, ocean tides, and the interaction between Earth’s solid crust and liquid core.
• Earth’s increasing spin speed reverses a decades-long trend of slowing days, raising the possibility of a negative leap second — where a second would be removed from atomic time to maintain global time sync.
• While 27 positive leap seconds have been added since 1972, a negative one has never been used, and its implementation ....