On 28th December 1612, Galileo Galilei became the first astronomer to observe the planet Neptune. The great astronomer incorrectly classified the planet as a fixed star. Galileo had demonstrated the telescope on 25 August 1609.
On 28th December 1612, Galileo Galilei became the first astronomer to observe the planet Neptune. The great astronomer incorrectly classified the planet as a fixed star. Galileo had demonstrated the telescope on 25 August 1609.