- A Sir William Thomson
- B William Oughtred
- C Giovanni Plana
- D Abi Bakr
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Answer:
C
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Explanation: In 1831-1835, mathematician and engineer Giovanni Plana devised a Perpetual Calendar machine, which, through a system of pulleys and cylinders and over, could predict the perpetual calendar for every year from AD 0 (that is, 1 BC) to AD 4000, keeping track of leap years and varying day length.
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