The AstroTrac lets you track stars at the sidereal, solar and lunar rates for two hours before needing a reset. The device has a payload capacity of 15kg.

A replica of Humphrey Cole's 1570 Nocturnal and Tide Computer in the British Museum, this calculates the time at night using the positions of the stars, as well as the times of tides.

6 Nocturnal and Tide Computer

Price £59 • Supplier Widescreen Centre 0207 9352580 •

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