This was probably the most advanced quantity system on the planet on the time, apparently in use a number of centuries earlier than the widespread era and well earlier than the event of the Indian numeral system. Rod numerals allowed the representation of numbers as massive as desired and allowed calculations to be carried out on the suan pan, or Chinese abacus. The date of the invention of the suan pan is not sure, however the earliest written point out dates from AD one hundred ninety, in Xu Yue’s Supplementary Notes on the Art of Figures. ), however its design seems to have been misplaced till experiments were made during the 15th century in Western Europe. Perhaps relying on comparable gear-work and technology discovered within the Antikythera mechanism, the odometer of Vitruvius featured chariot wheels measuring 4 toes (1.2 m) in diameter turning four-hundred times in a single Roman mile …

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