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The Antikythera mechanism (https://en.wikipedia.org/wiki/Antikythera_mechanism https://en.wikipedia.org/wiki/Antikythera_mechanism) "variously dated to about 87
by peter_d_sherman 7y ago
The Antikythera mechanism (https://en.wikipedia.org/wiki/Antikythera_mechanism https://en.wikipedia.org/wiki/Antikythera_mechanism) "variously dated to about 87 BC,[22] or between 150 and 100 BC,[13] or to 205 BC,[23][24]" -- may have been an early differential analyzer -- but that's a hypothetical conjecture...