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Engineer's Day in Iran

Engineer's Day in Iran is held on February 23. This day is celebrated to respect Nasir al-Din al-Tusi, Iranian scientist. This event in the third decade of the month February is annual.

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Nasir al-Din al-Tusi left behind a great legacy as well. Tusi is widely regarded as one of the greatest scientists of medieval Islam, since he is often considered the creator of trigonometry as a mathematical discipline in its own right.

In mathematics, al-Tusi pioneered spherical trigonometry and treated trigonometry as a new mathematical discipline. He developed six fundamental formulas for the solution of spherical right-angled triangles. He wrote on binomial coefficients, which Blaise Pascal later introduced.

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