Earth’s Days Are Getting Shorter and Scientists Are Racing to Keep Up #EarthScience #GPS

Did you know that Earth’s spin is not constant? Some days are slightly shorter than others, and the reason lies in a complex cosmic dance involving tides, winds, and the planet’s inner core.

Dennis McCarthy and his team explain how the moon’s gravity creates tides that gradually slow Earth down. Meanwhile, powerful atmospheric winds and shifting mass in Earth’s liquid core subtly change the speed of rotation. Even these tiny variations matter.

Using radio telescopes aimed at distant quasars and high precision GPS data, scientists can track changes in day length down to the millisecond. These shifts have real world consequences. They affect navigation systems and GPS accuracy, prompting experts to consider negative leap seconds to keep our clocks aligned with the planet.

We celebrate Dennis McCarthy and his team for revealing the hidden rhythms of our rotating world.

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