The Movement of Planet Earth

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“Already the regularity of its motion promises the most conclusive results. One collects numbers that, compared with the predictions of theory, permit one to appreciate how far the true pendulum approximates or differs from the abstract system called 'the simple pendulum.”- Leon Foucault. Most of us probably know the Earth rotates on an almost-vertical axis every 24 hours, which gives us one Earth day. Yet, this basic knowledge was not always so unquestionable. As far back as 470 BCE, ancient Greeks speculated the Earth itself moves. In 1851, French physicist Leon Foucault demonstrated how our planet rotates using his now-famous pendulum. Foucault first conducted his pendulum experiment in the Paris Observatory, then the Panthéon, where it remains an impressive centerpiece today. January 8 is recognized as Earth's Rotation Day annually. This important day is a reminder that the Earth spins on its axis, which is why we have day and night. This day is a great time to learn about how our planet moves and why it is so important for life on Earth. This year’s theme to observe Earth's Rotation Day is 'Honoring the Discovery of Our Planet's Movement'. A hypothetical line that passes directly through the Earth represents the axis around which the Earth rotates. The axis links the North and South Poles. Every 24 hours, the Earth rotates on this nearly vertical axis. However, it does not simply determine the length of our day or year. The earth's rotation also influences the seasons. The diameter of the Earth is 12,714 kilometres (7,900 miles) from the North to the South Poles and 12,756 kilometres (12,756 miles) through the equator (7,926 miles). History of Earth’s Rotation Day. The first human depictions of the cosmos date back to 1,600 BCE. A bronze disk found in Northern Europe shows the sun, a crescent moon, and the Pleiades star cluster, and written records from the Babylonians record the position of celestial bodies. Arguably the earliest scientific observations, these records make astronomy the oldest known science. Although humans have observed the stars for thousands of years some early theories proposed that the Earth moved the geocentric theory remained dominant in Europe until the work of Polish Astronomer Nicolaus Copernicus in the 1500s, which proved the Earth revolves around the sun. Following his work, others tried to prove the rotation of the Earth through various experiments. While the theory became accepted by the mid-1800s through observation of astronomical movements, it was Foucault’s pendulum that demonstrated, visibly and spectacularly, the rotation of the Earth. Today, Foucault’s Pendulums are a fixture in science museums, observatories, and universities all over the world. Ways to Observe Earth’s Rotation Day. The observation of Earth’s Rotation Day is personal. Notwithstanding, the following are some ideas regarding ways to observe this important day. Are you the fun-loving party type? If you are perhaps hosting a party in honour of Earth’s Rotation Day would be in your comfort zone. You could ask your guests to dress as their favourite scientists, such as Leon Foucault or Isaac Newton. Maybe you are not the party type; you could visit a space or science museum to see a version of Foucault’s Pendulum in real life. Another excellent way to spend time on Earth’s Rotation Day would be to do some research on the history of how the view of the earth’s relation to the universe has changed. This activity would be great for one’s science class. The Interconnectedness of Earth’s Movement. Earth Rotation Day not only reminds us of the planet’s dynamic nature but also emphasizes the importance of scientific discoveries in understanding our world. The day highlights the interconnectedness of natural processes and speaks to how such events have far-reaching consequences on humanity. In the words of Wendell Berry, the Earth is what we all have in common. Wayne Campbell is an educator and social commentator with an interest in development policies as they affect culture and or gender issues. waykam@yahoo.com @WayneCamo © #EarthRotationDay #LeonFoucault #astronomy

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