In what year did Galileo Galilei first systematically direct the telescope toward the heavens for scientific scrutiny?

Answer

1609

Galileo Galilei began the true revolution by turning the telescope skyward in 1609, shifting its purpose from a mere curiosity or military aid to a scientific instrument.

In what year did Galileo Galilei first systematically direct the telescope toward the heavens for scientific scrutiny?
astronomytelescopescienceimpacthumanity