All five of John Harrison’s famous timekeepers will be on display in a new exhibition at the National Maritime Museum this summer.

The Exhibition Ships, Clocks & Stars: The Quest for Longitude will run from July 11 to January 4.

H1, H2, H3 and H4 will move from the Royal Observatory Greenwich to be shown in the museum for the first time in nearly 30 years, while H5 is being loaned from the Worshipful Company of Clockmakers.