Earth's Shortest Day of 2026 Poses Threat to GPS and Satellites

This Sunday, July 26, 2026, will mark the shortest day of the year, with Earth's rotation being approximately 0.65 milliseconds shorter than the standard 24 hours. While imperceptible to humans, this tiny time change in Earth's rotation, influenced by factors like ocean currents and atmospheric pressure, is altering in ways unmatched in at least 3.6 million years. This shift poses a threat to precise timing systems like GPS and satellites, which rely on Coordinated Universal Time (UTC) to stay aligned with Earth's actual position.