27 feb 1650 anni - Kazimierz Siemienowicz Publishes the Artis Magnae Artilleriae pars prima

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A commander in the Polish Royal Artillery and an expert in artillery and rocketry, Siemienowicz published a design for multistage rockets, crucial for rockets heading to outer space. As well, he proposed delta wing stabilizers to increase accuracy. Unfortunately, he died a year later, rumoured to be an assassination by members of guilds opposed to him exposing their secrets.

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