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 T

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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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Size: 3030px × 4776px
Photo credit: © BABAK TAFRESHI/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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