Royal Observatory Greenwich

Whether it's observing the stars, standing astride the Prime Meridian or marvelling at John Harrison's timepieces, the Royal Observatory Greenwich provides a treasure trove of fascinating information. Read all about the history of space, time and navigation, plus find out more about the Insight Astronomy Photographer of the Year competition.

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Edmond Halley set out to sea to use magnetism as a possible solution to the problem of determining longitude.

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Neither the smallest nor the largest objects in the known Universe escaped the brilliant Hooke’s attention.

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George Biddell Airy was Astronomer Royal for much of the 19th century and he amassed a treasure trove of data.

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The Great Equatorial Telescope at the Royal Observatory kept Britain at the forefront of astrophysics and greatly expanded our knowledge of stars.

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The story of Astronomer Royal George Biddell Airy and the remarkable Airy Transit Circle telescope he designed at the Royal Observatory Greenwich.

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Discover the story of the founding of our Observatory, Britain's first state-funded scientific research institution.

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19th-century astronomers went beyond cataloguing the skies to understanding their composition and predicting what could not be seen.

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In August 2015 a paper was published by scientists in the US explaining why the Prime Meridian at the Royal Observatory Greenwich is 102 metres to the west of the prime meridian used by satellite based navigation and timekeeping, known as the International Reference Meridian or IRM. The paper created quite a stir in the media.

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Meridian astronomy is the meticulous surveying of the stars so that positions and movements of stars can be known accurately.

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Curator of the Royal Observatory, Louise Devoy, looks at Pepys's links to our site here in Greenwich.

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