Archive · 5 Aug 2025
Earth's Rotation Speeds Up, Leading to Shorter Days
Earth is spinning a bit faster, which is making days slightly shorter.
August 5, 2025, might be a record-breaker, with a day possibly being 1.34 milliseconds shorter.
This is because the Earth's core is slowing down relative to other parts of the planet.
Other things like winds, oceans, and even earthquakes can also affect how fast the Earth spins.
While these changes are tiny, they matter for precise technology like GPS and financial systems.
Timekeepers might need to adjust time to match this change.
August 5, 2025, may be one of the shortest days ever recorded, shortening the day by approximately 1.34 milliseconds.
Earth's rotation speed is influenced by factors including the planet's inner core, atmospheric winds, ocean currents, and major earthquakes.
The inner core's slowing rotation relative to the mantle and crust causes the Earth to spin faster to conserve angular momentum.
Shorter days have been observed in recent years, with July 5, 2024, holding the record for the shortest day at 1.66 milliseconds shorter than 24 hours.
Scientists and engineers are closely monitoring the changes, as these micro-adjustments affect GPS navigation and financial market timestamps.
- Who
- Scientists and engineers.
- What
- Earth's rotation is accelerating, resulting in shorter days.
- When
- August 5, 2025 (projected), and earlier in July 2025.
- Where
- Earth
- Why
- The exact reasons are not yet fully understood; the inner core's speed changes relative to the mantle is a significant factor.
- Potential Shortest Day
- August 5, 2025
- Speed Increase (August 5)
- Approximately 1.34 milliseconds faster
- Previous Shortest Day
- July 5, 2024
- Primary Influence
- Earth's Inner Core
