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Astronomical watch, c 1790.

Astronomical watch, c 1790.
4 0 c m
actual image size: 25cm x 32cm


George Margetts (1748-1808), a Freeman of the Clockmakers' Company of London, made a number of astronomical watches of this type. This watch shows mean time and tidal hours for ports around the country; it also indicates the position of the moon in the heavens, and the solar and lunar eclipses. The sun pointer rotates once in a 24 hour solar day, and the moon disc with its pointer once in a lunar day, which is 48 minutes longer.

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© Science Museum / Science & Society Picture Library

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