On this day Galileo observed Jupiter’s moons, providing a powerful argument that Earth may not be the center of the Universe, but instead circle the Sun.
Galileo recognized that his observations of Jupiter’s four moons supported the controversial theory of Copernicus—that Earth and all the other planets revolve about the Sun.
All his observations appeared in Sidereus Nuncius, 1610.
Sidereus Nuncius was the first published scientific work based on observations made through a telescope, and it contains the results of Galileo's early observations of the imperfect and mountainous Moon, the hundreds of stars that were unable to be seen in either the Milky Way or certain constellations with the naked eye, and the Medicean Stars that appeared to be circling Jupiter.
Reference:https://cosmology.carnegiescience.edu/timeline/1610/observing-the-moons-of-Jupiter
PDF:http://people.rit.edu/wlrgsh/Galileo.pdf
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