it was an astronomical calculator. A form of mechanical analog computer.
The nordon bombsight was also a form of mechanical analog computer.
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The Antikythera mechanism is believed to be the earliest known mechanical analog "computer" by Derek J. de Solla Price. 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. Devices of a level of complexity comparable to that of the Antikythera mechanism would not reappear until a thousand years later.
The first known analog computer is the antikythera mechanism. It was found underwater in 1900. It is believed to have been made prior to 100BC. Inventor unknown.
It was Professor John Vincent Atansoff. He developed it in 1939. It was invented in the Iowa State University.
The first analog computer invented was the Antikythera Mechanism, about 2000 years ago. One sample was found in an ancient shipwreck about 1910. It was designed to calculate astronomical positions for navigation. The first digital computer invented was the Analytical Engine, about 200 years ago. It was never built. It was entirely mechanical and intended to be powered by a steam engine. It was fully programable and general purpose with an architecture very much like modern electronic digital computers.
Here are some names of different candidates for "first computer" (depending on how you define computer):Antikythera mechanism - ~100 BCAnalytical engine - 1840s, never builtBush Differential Analyzer - 1929ABC - 1942Harvard Mark I - 1942Zuse Z3 - 1943, destroyed in WW2 bombing raidENIAC - 1945, very difficult to program as it had to be partially rewired for each problemEDSACLEO I - first mass produced computer in BritianEDVACUNIVAC I - 1951, first mass produced computer in US