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Since then, many other forms of reckoning boards or tables have been invented.
In a medieval European counting house, a checkered cloth would be placed on a table, and markers moved around on it according to certain rules, as an aid to calculating sums of money.
Devices of a level of complexity comparable to that of the Antikythera mechanism would not reappear until a thousand years later.
Many mechanical aids to calculation and measurement were constructed for astronomical and navigation use.
It was designed to calculate astronomical positions.
It was discovered in 1901 in the Antikythera wreck off the Greek island of Antikythera, between Kythera and Crete, and has been dated to circa 100 BC.
The sector, a calculating instrument used for solving problems in proportion, trigonometry, multiplication and division, and for various functions, such as squares and cube roots, was developed in the late 16th century and found application in gunnery, surveying and navigation.
The planimeter was a manual instrument to calculate the area of a closed figure by tracing over it with a mechanical linkage.
The processing element carries out arithmetic and logical operations, and a sequencing and control unit can change the order of operations in response to stored information.
A computer is a device that can be instructed to carry out arbitrary sequences of arithmetic or logical operations automatically.
The ability of computers to follow generalized sets of operations, called programs, enables them to perform an extremely wide range of tasks.
The planisphere was a star chart invented by Abū Rayhān al-Bīrūnī in the early 11th century.
The astrolabe was invented in the Hellenistic world in either the 1st or 2nd centuries BC and is often attributed to Hipparchus.