Explore l Learn l Facts on Instagram: "Eight hundred years ago, the Persian polymath Nasir al-Din al-Tusi created a brilliant geometric system called the Tusi Couple, which could transform perfect circular motion into straight-line motion. By placing a smaller circle rolling inside a larger circle exactly twice its size, Tusi showed that a point on the smaller circle would move back and forth in a straight line. This idea was revolutionary for its time and later influenced astronomical models, h

The Hindu–Arabic numeral system was invented between the I and IV centuries by Indian mathematicians. The system was adopted in Arabic mathematics by the IX century more widely known through the writings in Arabic of the Persian mathematician Al-Khwārizmī