The Earth's rotation has been accelerating at an unusual rate in recent years, posing a challenge to scientists and digital infrastructure. This change, although imperceptible in daily life, affects the way we measure time. The international conference on timekeeping, scheduled from October 13 to 15, 2026, may decide on a significant reform of universal time.
The Earth's rotation speed fluctuates due to various factors such as atmospheric and oceanic changes, and internal movements. To maintain the coordinated universal time (UTC), based on atomic clocks, close to the time determined by the Earth's rotation, an extra second, known as a leap second, can be added. Since 1972, 27 leap seconds have been introduced. However, with the Earth's accelerated rotation, the possibility of a negative leap second arises, which would require subtracting a second rather than adding one.
The issue primarily concerns the digital economy, as various systems such as telecommunications, electrical networks, banking systems, financial markets, the internet, GPS, and satellites rely on precise synchronization. A sudden subtraction of a second could disrupt certain computer systems. This risk is driving the reform of timekeeping. The 28th General Conference on Weights and Measures (CGPM) will examine a resolution to ensure the continuity of UTC.
The proposed project involves introducing a new system by May 20, 2027, allowing for a gradual divergence of up to 3,600 seconds, or one hour, between atomic time and Earth's rotation before correction. However, no seconds will be removed from clocks in October, and the International Earth Rotation and Reference Systems Service (IERS) has confirmed that no leap second will be introduced at the end of December 2026.
The October conference aims to decide whether humanity should gradually stop adjusting clocks to the irregularities of the Earth's rotation. This could mark a shift towards a continuous atomic time, ending the practice of adjusting clocks second by second to match the Earth's rotation. For millennia, clocks were set based on the Sun's movement, and this change could signify a definitive entry into the era of continuous atomic time.
The reform of timekeeping has significant implications for various sectors, including technology, finance, and transportation. A decision to abandon the traditional timekeeping system could have far-reaching consequences, affecting not only the way we measure time but also the synchronization of global systems. The outcome of the October conference will be crucial in determining the future of timekeeping.
As the world prepares for a potential change in timekeeping, experts and scientists will closely monitor the situation. The decision to adopt a new system will depend on various factors, including technological advancements and the need for precise synchronization. Ultimately, the goal is to ensure that timekeeping systems remain accurate and reliable, supporting the smooth functioning of global infrastructure and economies.
Key points
- A conference in October 2026 may decide to reform universal time due to the Earth's accelerated rotation speed.
- The proposed reform involves introducing a new system allowing for a gradual divergence of up to one hour between atomic time and Earth's rotation.
- The change could mark a shift towards a continuous atomic time, ending the practice of adjusting clocks to the irregularities of the Earth's rotation.
