On this day in 1625 - June 8th - Italian-French astronomer Giovanni Domenico (Jean-Dominique) Cassini was born.
Cassini was one of the most important astronomers of the 17-18th centuries, and was the first of four Cassinis to direct the Paris Observatory. The NASA/ESA/ASI Cassini-Huygens mission to Saturn bore his name because of his study of Saturn, which included the discovery of four of Saturn's moons.
On this day in 1812 - June 9th - German astronomer Johann Gottfried Galle was born.
Galle is best known for his being the first person to see the planet Neptune, knowing what he was seeing. This followed his search for the planet using the calculations Urbain Le Verrier had sent him. (Who discovered Neptune?)
On this day in 1710 - June 10th - Scottish telescope maker and astronomer James Short was born.
Short produced the first telescopes with nearly distortionless mirrors, and was the principal British collator and computer of the 'Transit of Venus' observations made throughout the world on 6 June 1761.
On this day in 2008 - June 11th - the Fermi Gamma Ray space telescope was launched.
The space observatory performs gamma-ray observations from low Earth orbit. Gamma rays are the highest energy radiation in the electromagnetic spectrum. The mission is a joint venture of NASA, the United States Department of Energy, and government agencies in France, Germany, Italy, Japan, and Sweden.
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