Time ball, Royal Observatory, Greenwich

Time ball, Royal Observatory, Greenwich

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Caption: Time ball, Royal Observatory, Greenwich, UK. This was the world's first public time signal. The time ball drops at exactly 13:00 GMT (Greenwich Mean Time) every day and is visible from the River Thames. It was introduced in 1833 by the then Astronomer Royal, John Pond.

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Keywords: 1800s, 1833, 19th century, 1st, astronomical, astronomy, england, english, europe, european, first, flamsteed house, gro, historical, history, london, public time signal, royal observatory greenwich, time ball, uk, united kingdom, wind vane

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