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You are here		www.guidelondon.org.uk John Harrison H4 - World's Most Important Clock Can Be Seen In Greenwich, London \| Guide London
\|	\|	www.space.com Royal Observatory Greenwich: The birthplace of modern astronomy turns 350 \| Space	1.9 parsecs away Travel
\|	\|	As the Royal Observatory Greenwich celebrates its 350th anniversary on June 22, 2025, we look back at its impacts on time, space and navigation.	1.9 parsecs away Travel
\|	\|	collection.sciencemuseumgroup.org.uk Marine Timekeeper known as 'H5' by John Harrison and Son 1770 \| Science Museum Group Collection	3.4 parsecs away Travel
\|	\|	Silver pair-cased marine timekeeper, known as H5, by John Harrison & Son, London.,White enamel dial with gold central star to adjust hands. Verge escapement with Harrison's special diamond pallets. Steel balance and spring. Fusee. Maintaining power. 7 1/2 seconds remontoir on 4th wheel. All wheels from the 3rd, jewelled. Long bimetallic strip on adjustable frame. Original key and starting pin. Signed 'John Harrison & Son London 1770 No. 2'. Case hallmarked for 1768 - 9 and stamped 'HT' (probably Henry Ta...	3.4 parsecs away Travel
\|	\|	www.rmg.co.uk Royal Observatory \| Royal Museums Greenwich	2.3 parsecs away Travel
\|	\|	Visit the home of Greenwich Mean Time (GMT), the Prime Meridian of the world and Londons only Planetarium	2.3 parsecs away Travel
\|	\|	www.pcgamer.com Starfield \| PC Gamer	6.5 parsecs away Travel
\|		Starfield news and coverage from PC Gamer	6.5 parsecs away Travel