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Tellurion c.1790-1800 English. A tellurion is an instrument that shows how the movement of the earth on its axis and around the sun causes day and night and the seasons.


Nocturnal, Italy, 17th century. A nocturnal is an instrument used to determine the local time based on the relative positions of two or more stars in the night sky


Diptych Dial, by Thomas Tucher, Nuremberg, c. 1620. Diptych dials are portable instruments, usually made from ivory. They were mainly produced in Nuremberg from the late fifteenth century onwards. They are based on the principles of vertical and horizontal sundials.