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Many mechanical aids to calculation and measurement were constructed for astronomical and navigation use. The planisphere was a star chart invented by Abū Rayhān al-Bīrūnī in the early 11th century. 6 The astrolabe was invented in the Hellenistic world in either the 1st or 2nd centuries BC and is often attributed to Hipparchus A mixture of the planisphere and dioptra , the astrolabe was efficiently an analog personal computer capable of functioning out several diverse sorts of problems in spherical astronomy An astrolabe incorporating a mechanical calendar computer 7 8 and gear -wheels was invented by Abi Bakr of Isfahan , Persia in 1235. 9 Abū Rayhān al-Bīrūnī invented the very first mechanical geared lunisolar calendar astrolabe, ten an early fixed- wired knowledge processing machine 11 with a gear train and gear-wheels, 12 circa 1000 AD.