The rotation of Earth is what really makes my day

Most of us probably know the Earth rotates on an almost-vertical axis every 24 hours, which gives us one Earth day. But this basic knowledge wasn’t always so undisputable. In 1851, French physicist Leon Foucault demonstrated how our planet rotates using his now-famous pendulum.

Today, Foucault’s Pendulums are a fixture in science museums around the world. The simple but brilliant contraption uses a suspended lead ball to indicate the rotation of the Earth over the course of a day. The pendulum is surrounded by small pins arranged in a circle, which the pendulum knocks down one by one, eventually completing a full rotation.

History: The rotation of the Earth and its relationship to our daylight cycles has fascinated philosophers and scientists for thousands of years. As far back as 470 BCE, ancient Greeks speculated the Earth itself moves, rather than having the rest of the sky revolving around us. In the 10th century CE, Muslim astronomers started building astrolabes and other instruments to measure the movement of the Earth relative to the stars.

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