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QWho devised the Perpetual Calendar machine?

ID: #7463 Computer Generations 195 views
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  • A Sir William Thomson ✔ ✖
  • B William Oughtred ✔ ✖
  • C Giovanni Plana ✔ ✖
  • D Abi Bakr ✔ ✖
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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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