Why did Galileo feel the need to write his famous letter?

Why did Galileo feel the need to write his famous letter?

In 1615, Galileo wrote a letter to Grand Duchess Christina, mother of his patron Cosimo de Medici, containing his work and defense of the Copernican System, and the letter was published in 1636. However, before this date, it was widely read and shared in intellectual circles.

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