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Astronomers and historians have argued ever since about whether Eddington’s belief that he already knew the answer led him to fudge the eclipse analysis by leaving out the warped astrograph.

In 2007, however, Daniel Kennefick, an astrophysicist and historian at the University of Arkansas, concluded after a long study of the records of the eclipse expedition that it was Dyson, the astronomer royal, who had decided to exclude the results from the astrograph.

That said, you might think twice before buying the latest luxury piece from Swiss company Caran d'Ache, which recently collaborated with watch and timepiece brand MB&F to create its limited edition Astrograph pen.