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Before the advent of accurate mechanical clocks, people used a variety of celestial instruments to tell time by the movement of the sun and the stars. In this episode we look at two examples of such instruments: an Aquitaine sundial ring - a replica of a device supposedly given by Eleanor of Aquitaine to King henry II in 1152 - and a nocturnal, a device developed in the 16th Century for measuring time at night.

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FURTHER READING:

https://sundials.org/index.php/teachers-corner/sundial-construction.html
https://www.shadowspro.com/en/sundials.html
https://plus.maths.org/content/analemmatic-sundials-how-build-one-and-why-they-work
https://www.mysundial.ca