Earth's accelerating rotation threatens digital timekeeping

The Earth's unpredictable rotation speed is creating a growing discrepancy between astronomical time and the precision of artificial atomic clocks. While the planet's rotation is influenced by factors such as liquid core dynamics and polar ice melt due to climate change, recent trends show the Earth is accelerating, shortening days by fractions of a millisecond.

Since 1972, the International Earth Rotation and Reference Systems Service has used the 'leap second' system to add time to Coordinated Universal Time (UTC) to keep computers aligned with the planet. However, the current acceleration may necessitate a 'negative leap second.' This would involve removing a second from digital clocks, causing them to skip from 23:59:58 directly to 00:00:00, a scenario that poses potential risks to global digital infrastructure.