The creation of Greenwich Mean Time

In 1676, Astronomer Royal John Flamsteed was looking to find a way to determine longitude at sea, so ships could know their position and hazards.

Feuds with Sir Isaac Newton, dirty rivers and a missing key are just some of the obstacles he contended with and overcame.

His labours ultimately paved the way to Greenwich Mean Time.

Emily Akkermans, Curator of Time at Royal Museums Greenwich, and Keith Moore from the Royal Society of London, speak to Allis Moss.

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(Picture: Greenwich Royal Observatory, London. Credit: Peter Thompson/Heritage Images/Getty Images)